Roulette is one of the most visually straightforward casino games ever devised — a wheel, a ball, a felt layout — and yet stepping up to a table for the first time can feel like arriving in a foreign country. Dealers speak in shorthand, regulars toss chips into positions with no obvious names, and the betting cloth is covered in numbers, colours, and French words that nobody ever bothered to translate for you. This glossary cuts through all of that. Whether you're preparing for your first live session, exploring online variants, or simply want to follow the action with genuine understanding, every significant roulette betting term is explained below.
The Wheel and Its Numbers
Before any bet makes sense, you need to understand what you're betting on. The roulette wheel is divided into numbered pockets. In European roulette, there are 37 pockets numbered 0 through 36. In American roulette, a second green pocket — the double zero (00) — is added, bringing the total to 38. This single difference has a dramatic effect on house edge: European roulette runs at approximately 2.7%, while the American version nearly doubles that figure to around 5.26%.
The pockets alternate between red and black for numbers 1–36, while zero and double zero are always green. The physical arrangement of numbers on the wheel is not sequential; they are distributed in a specific pattern designed to balance high/low and odd/even numbers around the circumference.
Inside Bets Explained
Inside bets are wagers placed directly on the numbered section of the betting layout. They offer higher payouts but lower probability of winning.
- Straight Up (Single Number Bet): A chip placed directly on any single number, including 0 or 00. Pays 35:1. This is the highest-paying standard bet on the table.
- Split Bet: A chip placed on the line between two adjacent numbers on the layout. It covers both numbers and pays 17:1.
- Street Bet (Three-Number Bet): A chip placed at the edge of a row of three consecutive numbers (e.g., 1, 2, 3 or 13, 14, 15). Pays 11:1.
- Corner Bet (Square Bet): A chip placed at the intersection of four numbers on the layout, covering all four simultaneously. Pays 8:1.
- Six-Line Bet (Double Street): A chip covering two adjacent rows of three numbers — six numbers total. Pays 5:1.
- Five-Number Bet (Basket Bet): Exclusive to American roulette. Covers 0, 00, 1, 2, and 3. Pays 6:1 but carries the worst house edge on the table — avoid it.
- Trio Bet: A three-number bet that always includes zero. In European roulette, the valid combinations are 0/1/2 or 0/2/3. Pays 11:1.
Outside Bets Explained
Outside bets are placed in the boxes surrounding the number grid. They cover larger groups of numbers and pay less, but they win more frequently. These are the foundation bets for most beginners and many experienced players.
- Red / Black: A bet on whether the winning number will land on a red or black pocket. Covers 18 numbers. Pays 1:1 (even money). Zero is not red or black — it loses this bet.
- Odd / Even: A bet on whether the winning number will be odd or even. Also pays 1:1. Zero is neither odd nor even and loses this bet.
- Low / High (1–18 / 19–36): Bets on whether the ball will land in the lower or upper half of the number range. Pays 1:1. Zero loses.
- Dozen Bet: Covers 12 numbers. The first dozen is 1–12, the second is 13–24, the third is 25–36. Pays 2:1.
- Column Bet: The layout has three vertical columns of 12 numbers each. A bet on a column covers all 12 numbers in that column. Pays 2:1. Zero is not in any column.
French and Called Bets
French roulette — and many European variants — includes a set of bets named after sections of the physical wheel rather than sections of the layout. These are known as called bets or announced bets, and they are placed verbally with the dealer or, in online versions, via a special racetrack interface.
- Voisins du Zéro (Neighbours of Zero): Covers the 17 numbers closest to the zero on the wheel — from 22 to 25 going via zero. Requires nine chips and uses a combination of splits, a street, and a corner bet. The term translates literally as "neighbours of zero."
- Tiers du Cylindre (Third of the Wheel): Covers 12 numbers on the opposite side of the wheel from zero — roughly from 27 to 33 going via the 5. Six chips are placed as six split bets. Often shortened simply to tiers.
- Orphelins (Orphans): Covers the eight numbers not included in either voisins or tiers — two small sections of the wheel that are "orphaned" between the two large sectors. Played with five chips, including one straight-up bet.
- Jeu Zéro (Zero Game): A smaller version of voisins du zéro, covering just seven numbers nearest zero. Requires four chips.
- Neighbours Bet: Any individual number and the two (sometimes three or four) numbers on either side of it on the wheel. If you ask for "17 and the neighbours," you receive five chips covering 17 plus the adjacent numbers on each side. This can be extended: "17 and four neighbours" covers nine numbers total.
- Finals Bet: A bet on all numbers ending in the same digit. "Finals 4" covers 4, 14, 24, and 34. Finals 7, 8, and 9 cover only three numbers each because there is no 37, 38, or 39.
Key Rules That Affect Your Bets
Two special rules apply in French roulette and some European variants that meaningfully reduce the house edge on even-money bets.
La Partage: French for "the sharing." When the ball lands on zero, even-money bets (red/black, odd/even, high/low) are split between the player and the house. The player receives half their stake back rather than losing everything. This cuts the house edge on even-money bets to roughly 1.35%.
En Prison: A slightly different handling of the same situation. When zero hits, even-money bets are "imprisoned" on the table for the next spin rather than partially returned. If the imprisoned bet wins on the following spin, the full original stake is returned (no winnings are added). If it loses, the house takes the whole bet. Mathematically, en prison and la partage produce the same expected return over time.
General Table and Session Terminology
Beyond bet types, a range of general terms governs how roulette is played and discussed.
- Bankroll: The total amount a player has available to wager in a session. Managing your bankroll sensibly — setting a loss limit before you start — is one of the most important habits in responsible gambling.
- House Edge: The mathematical advantage the casino holds over the player, expressed as a percentage of each bet. In European roulette, this is approximately 2.7% on most bets.
- Payout / Odds: The ratio at which a winning bet is paid. A 35:1 payout means a winning £1 straight-up bet returns £35 profit plus the original £1 stake.
- Table Minimum / Maximum: The lowest and highest stake allowed on any single bet at a given table. Casinos set these limits to manage risk on both sides.
- RNG (Random Number Generator): In online roulette, a certified software algorithm that ensures each spin produces a genuinely random outcome, independent of previous spins.
- Live Dealer Roulette: An online format in which a real croupier operates a physical wheel, streamed in real time to players at home.
- Croupier: The casino staff member who operates the roulette wheel, announces results, and manages chip payouts.
- No More Bets: The phrase (or equivalent signal) the croupier uses after spinning the ball to indicate that no further wagers may be placed for that round.
- Marker / Dolly: The small plastic or metal object the croupier places on the winning number after each spin. While the marker is on the table, no chips may be added to or removed from the layout.
- Colour Up: The process of exchanging lower-denomination chips for higher-denomination ones — typically when leaving a table.
- Cold / Hot Numbers: Informal terms for numbers that have appeared rarely or frequently during recent spins. These streaks have no predictive value — the wheel has no memory — but some players track them as part of their personal strategy.
- Martingale: The most widely known roulette betting system, in which a player doubles their stake after every loss, with the intention of recovering all losses on a single win. It carries significant risk of hitting table maximums or exhausting a bankroll during a losing run.
- D'Alembert: A slower progression system in which a player increases their stake by one unit after a loss and decreases it by one unit after a win.
- Fibonacci System: A staking sequence based on the mathematical Fibonacci series (1, 1, 2, 3, 5, 8, 13…), moving forward along the sequence after a loss and back two steps after a win.
Deposits, Payments, and Choosing Where to Play
Understanding the betting vocabulary is only part of the picture. Where you play matters too, particularly regarding deposit and withdrawal options. Players who prefer e-wallet transactions — for the speed and security they offer — should check which platforms genuinely support their preferred method; a good starting point for this research is the best Neteller casinos, which lists venues that have fully integrated the Neteller payment ecosystem, including fast withdrawals and proper bonus eligibility for e-wallet users.
Table limits and game variants also vary considerably between operators. A site might offer European roulette only at low stakes, while a competitor runs French roulette with la partage at high limits. Checking available variants before registering saves frustration later.
Putting It All Together
Roulette's vocabulary can seem intimidating at first glance, but it follows a logical structure once you see the patterns. Inside bets go deeper into the number grid for bigger returns; outside bets spread your coverage for steadier, smaller wins. French called bets allow you to back sections of the wheel rather than the layout. And rules like la partage and en prison can meaningfully tilt the odds in your favour on even-money wagers — but only if you know to look for them. Carry this glossary into your next session, and the table will feel considerably less foreign.