Baseball Catching & Battery Glossary: 100+ Catcher Terms, Clearly Defined
Catching terms defined: the battery is the pitcher and catcher, framing steals strikes, and pop time is the throw to second (about 2.0 seconds in MLB). Plus the five-hole, indicators, catcher's interference, wrist coaches and 100+ more catcher terms in plain English, grouped by skill.
In this guide · 15 sections
- Gear for this
- People & roles
- Receiving & the strike zone
- Blocking, throwing & defense
- Calling the game
- Stances, setup and catcher's positioning
- Location and zone terms (how catchers talk about where a pitch goes)
- Rules every catcher should know
- Pitch counts, workload and arm-care terms
- Stats and scouting terms for catchers
- Pitch-calling technology terms
- Dugout slang you'll hear around the plate
- Pitch types the battery calls
- Gear, the field & rules
- FAQ
Key takeaways
- The battery = pitcher + catcher; in scorekeeping the pitcher is 1 and the catcher is 2.
- Framing = receiving borderline pitches for strikes; a called strike is worth ~0.13 runs.
- Pop time = glove-to-glove time to second base; ~2.0s is the MLB average.
- The five-hole = the gap between a catcher's knees, plugged by the glove on a block.
- Indicator = a pre-set sign that tells the pitcher which following sign is live (anti-sign-stealing).
- Pop time = transfer + footwork + arm, and the transfer is the most coachable piece.
- The standard pitching distance is 60'6" (46' in Little League majors); home plate is 17" wide.
Quick definitions of the terms people search most: the battery is the pitcher and catcher as a unit; framing is receiving a borderline pitch so it's called a strike; pop time is the time from the pitch hitting the catcher's mitt to the throw reaching the fielder at second base; blocking is smothering a pitch in the dirt so it stays in front; and an indicator is a pre-set sign that tells the pitcher which of the catcher's signs is live. Everything else a catcher, coach or parent hears around home plate is below.
The language of the position, in one place. These are the terms you'll hear around the plate and the dugout, defined plainly, grouped by topic, and linked to the deep dives where there's more to know. Bookmark it for the next time a broadcaster, coach, or 12-year-old uses a word you'd rather not nod along to.
The glossary is organized the way a catcher actually learns the position: who's who, then receiving and the zone, then blocking and throwing, then the mental game of calling pitches, plus the equipment and the field measurements that frame all of it. Every cross-link points to a full breakdown if you want more than a one-line definition.
People & roles
| Term | Definition |
|---|---|
| Battery | The pitcher and catcher considered as one unit, scored separately (1 and 2) but coached as one. See what a battery is. |
| Tools of ignorance | Old nickname for the catcher's protective gear (mask, chest protector, shin guards), ironic, since catching is the thinking position. |
| Handling a staff | A catcher's skill at managing pitchers, calling games, sequencing, keeping them calm, valued separately from hitting. |
| The slot | The catcher's setup position relative to the hitter and umpire, giving the ump a clean look at the pitch. |
| Personal catcher | A catcher paired with one specific pitcher who throws measurably better to him, common with knuckleballers and quirky veterans. |
| Backstop | Slang for a catcher (also the screen behind home plate that stops errant pitches). |
| Bullpen catcher | A staff member who catches relievers warming up and starters' side sessions, a key, often-unsung role in building a pitcher's feel. |
Receiving & the strike zone
| Term | Definition |
|---|---|
| Receiving | Catching the pitch cleanly and quietly, the foundation skill behind framing. See catching fundamentals. |
| Framing | Receiving borderline pitches so they're called strikes. Worth ~0.13 runs each; see pitch framing. |
| Shadow zone | Statcast's term for the band of pitches straddling the edge of the zone, where framing actually matters most. |
| One-knee stance | A modern setup with one knee down (used mainly with no runners on), lowering the catcher to receive and frame the bottom of the zone and easing wear over a season. |
| Primary / secondary stance | Primary = relaxed setup with no one on; secondary = the athletic, ready stance with runners on, so the catcher can block and throw. |
| Target | Where the catcher's glove is set to ask for the pitch, the spot on the 17-inch plate the battery is aiming at. |
| Stick it / quiet hands | Receiving a pitch and freezing the glove on the edge, no stabbing, so the call holds. |
| Beat the ball to the spot | Getting the glove to the catch point early so you receive moving toward the zone, not reaching back into it. |
| Giving with the pitch | Softening the hands on contact so a hard pitch settles quietly instead of recoiling out of the zone. |
| Pancake glove | A flat, pocketless training mitt that forces soft, give-and-stick hands, balls pop out if the hands are loud. |
Blocking, throwing & defense
| Term | Definition |
|---|---|
| Block | Smothering a pitch in the dirt with the body so it stays in front (not catching it, deadening it). See how to block pitches. |
| Five-hole | The gap between the catcher's knees; the glove drops to fill (plug) it on a block so a pitch in the dirt can't skip through. |
| Pop time | Glove-to-glove time on a throw to second base; ~2.0s is MLB average. See pop time by age. |
| Exchange (transfer) | Getting the ball from the mitt to the throwing hand and gone; the most coachable part of pop time. See throwing fundamentals. |
| Footwork (replace / jab step) | The lower-half move that turns a catch into a throw to second; efficient footwork shaves more off pop time than arm strength. |
| Passed ball vs. wild pitch | A passed ball is scored as the catcher's miss on a catchable pitch; a wild pitch is the pitcher's fault. Both let runners advance, but they're charged to different players. |
| Pitchout | A fastball thrown intentionally off the plate so the catcher can stand and throw on a suspected steal. |
| Backpick | A snap throw from the catcher to a base behind a runner who's leaning, trying to pick him off. |
| Blocking the plate / the tag | Catching a throw and applying the tag on a runner trying to score, now governed by collision rules that protect the catcher. |
| Pop-up priority | The catcher fields foul pop-ups near the plate; the spin carries them back toward the infield, so he turns his back to the diamond to track them. |
Calling the game
| Term | Definition |
|---|---|
| Signs / signals | The finger code calling pitch and location (1 = fastball, 2 = curve…). See catcher signs. |
| Indicator | A pre-set sign that tells the pitcher which of the following signs is live, used with a runner on second to beat sign-stealing. |
| Sequence / hot number | A running rule (e.g., outs-plus-one) that determines which flashed sign is the live one. |
| Cross-up | Pitcher and catcher on different signs, the catcher expects one pitch and gets another. Dangerous and avoidable. See the battery. |
| Working the count | Sequencing pitches to stay ahead; hitters are far better in counts like 2-0 and 3-1 than 0-2. See calling a game. |
| Ahead / behind in the count | Ahead = more strikes than balls (the pitcher's count); behind = more balls (the hitter's count). Drives every pitch choice. |
| The chase | A two-strike pitch deliberately off the plate, meant to be swung at, not a strike. |
| Put-away pitch | The pitch a battery trusts to finish a hitter with two strikes, usually their best swing-and-miss offering. |
| Setting up a hitter | Using earlier pitches to make the put-away pitch more effective (e.g., climbing the ladder, then a low breaking ball). |
| Tunneling | Two different pitches that look identical out of the hand and diverge late, so the hitter can't tell them apart. |
| Eye level | Moving pitches up and down to disrupt a hitter's timing, a core game-calling tool. |
| Painting / dotting | Hitting the very edge of the zone with precision. |
| Establishing the fastball | Throwing fastballs early to set a baseline of timing that off-speed pitches then disrupt. |
Want these in action rather than in a list? Start with the five catching fundamentals and work outward through the cluster.
Stances, setup and catcher's positioning
| Term | Definition |
|---|---|
| Catcher's box | The rectangle behind home plate where the catcher must stay until the pitch leaves the pitcher's hand. |
| Setting up | Moving into position (inside, outside, low) before the pitch so the target is where the call is. Set up late with a runner on second so he can't read location. |
| Sitting | Slang for being in the crouch. "Sitting inside" means set up on the inner third. |
| Wide base / narrow base | How far apart the catcher's feet are. Wider lowers the body for low strikes; narrower is quicker for throws and blocks. |
| Knee savers | Wedge-shaped pads that strap behind the knees so the catcher can rest weight on them in the crouch. Youth versions like the Champro youth knee support (about $17) are common from 9U up. |
| Flex (glove-side flex) | Keeping the glove arm slightly bent and relaxed so it can move to the ball, rather than locked straight. |
| Throwing hand behind the back / behind the leg | Where youth catchers hide the bare hand with nobody on, so foul tips can't hit it. With runners on, it tucks behind the mitt instead. |
| Relaxed receiving | Letting the glove "hang" low between pitches and rise to the ball, which keeps umpires' view clear and hands soft. |
Location and zone terms (how catchers talk about where a pitch goes)
| Term | Definition |
|---|---|
| Glove side / arm side | Locations named from the pitcher's view. Glove side is the side of his glove hand; arm side is his throwing-arm side. Coaches use these because "in" and "away" flip with left and right-handed hitters. |
| In / away | Inside means close to the hitter's body; away means the far side of the plate. See the full grid in pitch locations explained. |
| Up / down (elevate / bury) | Vertical location. "Elevate" is a fastball at the letters; "bury" is a breaking ball in the dirt on purpose. |
| The black / painting the black | The thin black border on the edge of home plate. "Painting the black" means hitting the plate's edge. |
| Front door / back door | A breaking pitch that starts off the plate and breaks back over the inside corner (front door) or the outside corner (back door). |
| Climbing the ladder | Throwing successive fastballs higher and higher, getting a chasing hitter to swing at one above the zone. |
| Middle-middle / cookie | A pitch right down the middle; the one location a battery never calls on purpose. |
| Chase zone / waste pitch | The area just off the plate where hitters can be tempted to swing; a waste pitch is thrown there deliberately. |
| Nine-zone grid | Dividing the strike zone into a 3 x 3 grid (numbered 1 to 9) so pitches and locations can be called by number. |
Rules every catcher should know
Plain-English versions of rules that involve the catcher directly. Wording and details vary between MLB, NFHS (high school) and youth rulebooks, so check your league's current rules for the exact language.
| Term | Definition |
|---|---|
| Catcher's interference | When the catcher's mitt (or body) touches the bat or hinders the batter during a swing. Generally the batter is awarded first base, with options for the offense if the play produced more. |
| Catcher's balk | On an intentional walk thrown with pitches, the catcher must stay in the catcher's box until the ball leaves the pitcher's hand. Stepping out early can be called a balk. (Many levels now allow an automatic intentional walk with no pitches.) |
| Dropped third strike (uncaught third strike) | When strike three isn't caught cleanly with first base open, or with two outs, the batter may run to first. Youth divisions differ on when this applies; see our rules by age chart. |
| Home plate collision rule | Rules at most levels now bar a catcher from blocking the plate without the ball and bar runners from targeting the catcher. The specific wording differs by rulebook. |
| Obstruction | A fielder without the ball (including the catcher) impeding a runner. At home plate, this is usually a catcher set up in the base path before the throw arrives. |
| Required catcher's equipment | Youth rulebooks like Little League's require catchers to wear a catcher's helmet and mask with a throat protector, chest protector, shin guards and (for male catchers) an athletic cup, including when warming up pitchers. A complete youth catcher's set covers most of it. |
| Catcher and pitcher crossover rules | Little League limits pitching after catching 4+ innings and catching after throwing 41+ pitches in a day. The tables are in our pitch count rules guide. |
| Mound visit | A trip to the mound by a coach or (at many levels) the catcher. Most levels limit coach visits per inning or game; catcher visits may or may not count, depending on the rulebook. |
Pitch counts, workload and arm-care terms
| Term | Definition |
|---|---|
| Pitch count | The number of pitches thrown to batters in a game. Youth leagues cap it by age (for example, 85 a day at 11 to 12 under Pitch Smart). |
| Days of rest | Required calendar days off between pitching appearances, scaled to the previous day's pitch count. |
| Pitch Smart | The youth pitching guidelines published by USA Baseball and MLB: daily limits, rest days, annual innings and pitch-type ages. |
| League age | A player's age on a league's cutoff date, which decides the division and the pitch count table that applies. |
| Bullpen / pen | The warm-up area for pitchers, and also a practice session ("throw a pen") on a mound to a catcher. |
| Long toss | Throwing at gradually increasing distances to build arm strength and feel. Catchers use it too; their arms work every inning. |
| Arm slot | The angle of the pitcher's arm at release (over the top, three-quarters, sidearm). A dropping arm slot late in a game is a fatigue warning. |
Stats and scouting terms for catchers
| Term | Definition |
|---|---|
| Caught stealing percentage (CS%) | The share of stolen-base attempts the catcher throws out. MLB averages have run roughly a fifth to a quarter of attempts in recent seasons; youth numbers vary wildly with rules and field size. |
| Framing runs | An estimate of runs a catcher saves (or costs) by turning borderline pitches into strikes, published by Statcast and other analytics sites. |
| Blocks above average | A Statcast-style measure of how many pitches in the dirt a catcher keeps in front compared with an average catcher. |
| Exchange time | The slice of pop time from catch to release, usually well under a second for good high school and college catchers. |
| Arm strength (velo to second) | The speed of the catcher's throw, often measured with a radar gun at showcases. |
| Catcher ERA | A pitching staff's ERA with a given catcher behind the plate. Popular in conversation, noisy as evidence. |
| Pop-to-pop | Scouting shorthand for the full pop time measurement from glove to glove. Time it at home with a simple digital sports stopwatch (about $10) using the method in our pop time guide. |
Pitch-calling technology terms
How signs get from the dugout to the catcher is changing fast, so the vocabulary is too.
| Term | Definition |
|---|---|
| Wristband / wrist coach | A band with a clear window holding a card of numbered calls. The coach yells or flashes a number, the catcher reads the call. A 3-window youth band like the Sports Unlimited youth triple wrist coach costs about $12. |
| Play card / call sheet | The printed grid inside a wristband that maps numbers to pitch and location. |
| Calling from the dugout | The coach, not the catcher, chooses each pitch. Common in youth and college baseball. See how to call pitches from the dugout. |
| Electronic pitch calling | Sending the call to the catcher's ear (and sometimes the pitcher's) through a device instead of hand signs. Rules on where it's allowed vary by level; see our electronic pitch calling guide. |
| Pitch-calling app | Phone software that lets a coach tap a pitch and location and speaks it to the catcher. MAVTRAX is a free one. |
| Helmet headset | A small Bluetooth speaker pod that velcros inside a catcher's helmet to hear spoken calls. Our top pick is a motorcycle-style helmet-mount Bluetooth headset at about $13; the full comparison is in the best headsets for a catcher's helmet. |
| Sign stealing | An opponent (usually a runner on second) decoding the catcher's signs. Legal on the field by observation at most levels; the reason indicators exist. See how to prevent sign stealing. |
Dugout slang you'll hear around the plate
| Term | Meaning |
|---|---|
| Dish | Home plate. |
| Gas / cheese / heat | A hard fastball. "High cheese" is a fastball up in the zone. |
| Hook / Uncle Charlie / yakker | A curveball. |
| Chin music | A pitch up and in near the hitter's face. Not something to teach kids. |
| Frozen rope / seed | A hard, flat line drive (or a hard, accurate throw, like a catcher's throw to second). |
| Pea | A hard, accurate throw. "He threw a pea to second." |
| Punch out / backwards K | A strikeout; a backwards K in the scorebook marks a called strike three, which is where framing shows up. |
| Wheelhouse | The location where a hitter does the most damage; the catcher's job is to keep pitches out of it. |
| Ducks on the pond | Runners on base, especially in scoring position. |
Pitch types the battery calls
Game-calling means choosing between pitches, so here are the ones a catcher puts down most often. The exact movement varies by pitcher, but the families are standard.
| Pitch | What it does |
|---|---|
| Four-seam fastball | The straightest, hardest pitch, thrown for velocity and to attack the top of the zone. |
| Two-seam / sinker | A fastball with arm-side run and sink, used to induce ground balls and weak contact. |
| Cutter | A fastball that breaks slightly to the glove side late, bridges fastball velocity and slider movement. |
| Slider | A breaking ball with tight, lateral, glove-side break, a common two-strike put-away pitch. |
| Curveball | A slower breaking ball with bigger top-to-bottom break; used to change eye level and steal early strikes. |
| Changeup | An off-speed pitch thrown with fastball arm action but lower velocity, disrupting a hitter's timing. |
| Splitter | An off-speed pitch that tumbles down out of the zone late, a swing-and-miss weapon. |
| Knuckleball | A nearly spinless pitch that flutters unpredictably, so hard to catch that it often calls for a personal catcher and an oversized mitt. |
Gear, the field & rules
The equipment a catcher wears and the measurements that define his job. A complete youth catcher's set covers the protective basics below.
| Term | Definition |
|---|---|
| Catcher's mitt | A round, heavily padded glove with no individual finger slots, built to absorb fastballs all game. |
| Chest protector | Padded armor over the torso, the surface a catcher blocks balls into. |
| Shin guards / leg guards | Protective gear over the knees and shins, hinged so the catcher can drop into a block. |
| Catcher's helmet / mask | Head and face protection, either a hockey-style helmet or a traditional mask over a skull cap. |
| Pitching distance | 60 feet 6 inches in MLB, high school, and most adult ball; 46 feet in Little League majors. |
| Home plate | The 17-inch-wide five-sided slab that defines the strike zone's width. |
| Home to second base | 127 feet 3⅜ inches in MLB, the throw that defines a catcher's pop time. |
| Strike zone | The volume over home plate from the hitter's knees to the midpoint of the torso, what framing and game-calling are fought over. |
| Dropped third strike | If the catcher fails to cleanly catch strike three (with first base open or two outs), the batter can try to reach first. |
FAQ
What is the battery in baseball?
The pitcher and catcher considered as one unit. In scorekeeping the pitcher is position 1 and the catcher is position 2, every play starts with them. See our full explainer on what a battery is.
What is the five-hole in catching?
The gap between a catcher's knees. On a block, the catcher drops the glove down to fill (plug) the five-hole so a pitch in the dirt can't skip through underneath.
What's the difference between a passed ball and a wild pitch?
A passed ball is the catcher's error on a pitch he should have handled; a wild pitch is charged to the pitcher for a ball too errant to catch. Both allow runners to advance, but they're scored against different players.
What does it mean to frame a pitch?
To receive a borderline pitch with quiet hands so the umpire is more likely to call it a strike. A called strike is worth roughly 0.13 runs, so consistent framing adds up to real value over a season.
What is an indicator in catcher signs?
A pre-set sign that tells the pitcher which of the signs that follow is the live one. It's used with a runner on second base (who can see the catcher's hand) to prevent sign-stealing.
What is pop time, and what's a good number?
Pop time is the glove-to-glove time on a catcher's throw to second base, measured from the instant the pitch hits the mitt to when the middle infielder catches it. The MLB average is about 2.0 seconds. The exchange and footwork matter more than raw arm strength; see our pop-time-by-age breakdown.
What is a one-knee catching stance?
A modern setup with one knee on the ground, used mainly with no runners on base. It lowers the catcher's center of gravity, makes the bottom of the zone easier to receive and frame, and reduces wear on the legs over a long season.
What does 'handling a staff' mean?
A catcher's ability to manage pitchers, calling smart games, sequencing pitches, and keeping a rattled pitcher calm. It's valued independent of a catcher's hitting, because a good game-caller can make an entire pitching staff better.
What is a cross-up?
When the pitcher and catcher are on different signs, the catcher sets up for one pitch and gets another. It often results in a passed ball and is exactly what indicators and electronic pitch-calling are designed to prevent.
What is catcher's interference?
When the catcher's mitt or body touches the bat or hinders the batter during a swing. The batter is generally awarded first base. Details (and offense options when the play went well for them) vary by rulebook.
What does 'painting the black' mean?
Throwing a pitch on the very edge of home plate. The black is the thin border around the plate, so a pitch there is a strike that's hard to hit squarely.
What is a wrist coach in baseball?
A wristband with a clear window holding a card of numbered calls. The coach calls a number and the catcher (or fielders) read the matching pitch or play. They're a common youth alternative to hand signs.
Why is catching gear called the tools of ignorance?
It's an old, ironic nickname for the mask, chest protector and shin guards, suggesting only someone foolish would squat behind the plate. It's ironic because the catcher is usually the most involved thinker on the field.
How far is the pitcher from the catcher?
60 feet 6 inches in MLB, high school, and most adult baseball; 46 feet in Little League's major division. Home plate, the target between them, is 17 inches wide.
We're the team behind MAVTRAX, a free pitch-calling app. This is a research guide: picks are chosen on manufacturer specs, league rules, build quality and real-world price, checked against live listings, not on who pays the highest commission. We haven't hands-on tested every product. Full criteria on how we pick.