| Definition | Exemple |
| Reel (Bobine) | Vertical column of symbols that spins with each bet. | A 5x3 slot has 5 reels and 3 visible symbols per reel. |
| Auto-play | Function allowing several spins to be launched automatically in a row. | |
| Paylines | Lines on which symbols must align to generate a win. | 3 identical symbols aligned on an active line = win. |
| Scatter | Symbol triggering a bonus or free spins, without following the paylines. | 3 or more scatters anywhere → free spins. |
| Wild | Joker symbol replacing others to complete a combination. | 2 symbols + 1 wild = winning combination. |
| Free Spins | Free spins offered with real winnings or bonuses. | XX number of free spins offered on a predefined machine. |
| Volatilty | Level of risk of a machine. |
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| RTP (Return To Player) | Theoretical percentage redistributed to players. | RTP 96% = €96 returned for every €100 wagered (in the long run). |
| Progressive Jackpot | Common prize pool that increases with players' bets. | Jackpot displayed at €250,000 before being won. |