Glossary of Slot Terminology

Slot Terminology Diagram

Illustration of common slot machine features and terminology

Slot Terminology Glossary – Essential Terms for Beginners & Intermediate Players

This helpful glossary explains key slot machine terms, from basic mechanics to advanced features. Whether you're new to slots or brushing up, these definitions will help you understand reviews, paytables, and game rules better.

Common Slot Terminology

Blank: Empty spaces on reels between symbols. They make winning combinations harder to hit.
Bonus: Extra rewards (coins or spins) triggered by specific bets or symbols. Often proportional to your wager size.
Bonus Feature / Round: A separate mini-game activated by scatter or bonus symbols. Offers free spins, multipliers, or pick'em games – separate from base play.
Bonus Symbol: Special icon (usually 3+ needed) that triggers the bonus round.
Coins / Credits: Virtual currency used for bets and payouts. Buy with real money; cash out winnings as cash.
Double Up / Gamble Feature: Optional risk game after a win – guess color/suit to double (or lose) winnings.
Hit Frequency: How often a slot pays out (any win). High frequency = frequent small wins; low = rare big wins.
Jackpot: The top prize. Fixed (set amount) or progressive (grows with bets).
Loose Slot: Slot that pays out frequently (high hit frequency), though wins may be small.
Multiplier: Symbol or feature that multiplies wins (e.g., 2x, 3x).
Payline: Line across reels where matching symbols create wins. Classic: 1–20; modern: 243+ ways or Megaways.
Paytable: Screen showing symbol values, paylines, rules, and bonus details – always check before playing.
Payout Percentage (RTP): Return to Player – theoretical % returned over time (e.g., 96% RTP = $96 back per $100 wagered long-term).
Progressive Jackpot: Jackpot that grows with each bet across linked machines/network – can reach millions.
RNG (Random Number Generator): Software ensuring every spin is random and fair – no patterns or “hot/cold” streaks predictable.
Reels: Vertical columns that spin and display symbols (usually 3–6 reels).
Scatter Symbol: Pays anywhere on reels (not on payline) and often triggers free spins/bonus.
Tight Slot: Slot that pays infrequently (low hit frequency).
Video Slot: Modern digital slot with animated graphics, bonus rounds, and themes (vs classic mechanical).
Volatility / Variance: Risk level: Low = frequent small wins; High = rare big wins.
Wild Symbol: Substitutes for other symbols to complete wins (like a joker).