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| Odd-Number Bet | |
| A wager that one of the odd numbers will win the next spin. | |
| Odds | |
| The likelihood of an event happening. | |
| On the Square | |
| A game that is honest. | |
| Orphans / Orphelins | |
| It's a bet on three specific numbers 6, 34 and 17 that are neighbors on the wheel, but far apart on the layout. This is a French phrase which is common in European casinos. | |
| Outside Bet | |
| One of the 2-to-1 or even-money bets found on the outside of the roulette layout: Red, Black, Odd, Even, High or Low. | |
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Do you know more ? |
