Glossary

The terms behind the chart, one sentence each.

Positions

UTG: Under the gun, the first seat to act pre-flop, directly left of the big blind.
HJ: Hijack, the seat two to the right of the button and the second to act in 6-max.
MP: Middle position, the seats between under the gun and the cutoff; in 6-max this is the hijack.
CO: Cutoff, the seat directly right of the button and the last to act before it.
BTN: Button, the dealer seat, which acts last on every post-flop street.
SB: Small blind, the seat left of the button that posts half a big blind before the deal.
BB: Big blind, the seat that posts a full bet before the deal and acts last pre-flop.
IP: In position, acting after your opponent on each street.
OOP: Out of position, acting before your opponent on each street.
EP: Early position, the first seats to act, where opening ranges are tightest.
LP: Late position, the cutoff and button, where opening ranges are widest.

RFI: Raise first in, opening the pot with a raise when no one has entered before you.
Open: The first raise in an unopened pot; the same thing as an RFI.
Limp: Entering the pot by calling the big blind instead of raising.
3-bet: The first re-raise pre-flop, so called because the big blind counts as the first bet and the open as the second.
4-bet: A re-raise of a 3-bet.
5-bet: A re-raise of a 4-bet, almost always all-in at 100 big blinds.
Squeeze: A 3-bet made after an open and at least one caller, aiming to fold out both.
Cold call: Calling a raise when you have not yet put money in the pot.
Flat: Calling a raise rather than re-raising, usually to keep the pot small in position.
Iso-raise: Raising over one or more limpers to isolate a weak player heads-up.
Shove: Betting or raising all-in.
Steal: Opening from the cutoff, button, or small blind mainly to win the blinds uncontested.
Check: Passing the action without betting, which the big blind can do pre-flop when no one raises.

Suited: Two hole cards of the same suit, written with an s, like A5s.
Offsuit: Two hole cards of different suits, written with an o, like KQo.
Pocket pair: Two hole cards of the same rank, like 99.
Broadway: Any card ten through ace, or a hand made of two of them.
Suited connector: Two suited cards next to each other in rank, like 87s.
Gapper: Two cards with one or more ranks skipped between them, like 97s.
Blocker: A card in your hand that makes it less likely an opponent holds a specific strong hand.
Kicker: The side card that decides the winner between two hands of the same rank.
Wheel: The lowest straight, ace through five.
Nuts: The best possible hand given the board.
Rainbow: A flop with three different suits, so no flush draw is possible.
Wet board: A board with many straight and flush draws available.
Dry board: A board with few draws, like K72 rainbow.
Runout: The community cards that come after the flop, or the whole board when dealt to the end.
Showdown: Turning the cards face up after the river to decide the pot.

VPIP: Voluntarily put money in pot, the share of hands where a player called or raised pre-flop.
PFR: Pre-flop raise, the share of hands where a player raised pre-flop.
3-bet %: How often a player re-raises when facing an open.
Fold to 3-bet: How often a player folds their open when re-raised.
Equity: Your share of the pot if the hand were run out many times from here.
EV: Expected value, the average result of a decision over many repetitions.
Pot odds: The price you are offered to call, as the ratio of the call to the total pot.
Combos: The number of distinct two-card ways to make a hand: six for a pair, four suited, twelve offsuit.
bb: Big blinds, the unit used to size stacks and bets independent of the actual stakes.
bb/100: Win rate measured in big blinds won per hundred hands.
Range: The full set of hands a player could hold in a spot, given how they have played it.
Polarized: A range made of very strong hands and bluffs with little in between.
Linear: A range made of the strongest hands down to a cutoff, with no bluffs mixed in.
MDF: Minimum defense frequency, how often you must continue against a bet so the bettor cannot profit with any two cards.
SPR: Stack-to-pot ratio, the effective stack divided by the pot on the flop.

TAG: Tight-aggressive, a player who enters few pots and raises rather than calls.
LAG: Loose-aggressive, a player who enters many pots and applies constant pressure.
Nit: A very tight player who only plays premium hands and rarely bluffs.
Calling station: A player who calls too much and folds too little, so bluffing them is a mistake.
Maniac: A wildly aggressive player who raises and bluffs far more than any range justifies.
Reg: Regular, an experienced player who plays the game often and reasonably well.
Fish: A weak player who makes large, repeated mistakes.
Whale: A weak player with a very large bankroll.

6-max: A table with six seats, the format this chart is built for.
Full ring: A table with nine or ten seats, where opening ranges are tighter than 6-max.
Cash game: A game where chips have direct cash value and you can leave at any time.
MTT: Multi-table tournament, where blinds rise over time and only the last players standing get paid.
SNG: Sit and go, a single-table tournament that starts when the seats fill.
Heads-up: A pot or game between exactly two players.
Straddle: A voluntary blind bet posted before the deal, usually double the big blind, that moves the action.
Rake: The fee the house takes from each pot.
GTO: Game theory optimal, a strategy that cannot be exploited no matter how the opponent plays.
Exploitative: A strategy that deviates from GTO to take advantage of a specific opponent's mistakes.