Roulette is a casino game named after a French diminutive for little wheel. In the game, players may choose to place roulette bets on either a single number or a range of numbers, the colors red or black, or whether the number is odd or even. The roulette odds are based on probability. To determine the winning number and color, a croupier spins a wheel in one direction, then spins a ball in the opposite direction around a tilted circular track running around the circumference of the wheel. The ball eventually loses momentum and falls on to the wheel and into one of 37 (in French/European roulette) or 38 (in American roulette) colored and numbered pockets on the wheel. Roulette players have a variety of betting options. Placing inside roulette bets is either selecting the exact number of the pocket the ball will land in, or a small range of pockets based on their proximity on the layout. Players wishing to bet on the 'outside' will select roulette bets on larger positional groupings of pockets, the pocket color, or whether the winning number is odd or even. The payout roulette odds for each type of bet are based on its probability. The roulette table usually imposes minimum and maximum bets, and these rules usually apply separately for all of a player's inside and outside roulette bets for each spin. For inside roulette bets at roulette tables, some casinos may use separate roulette table chips of various colors to distinguish players at the table. Players can continue to place roulette bets as the ball spins around the wheel until the dealer announces no more roulette bets. When a winning number and color is determined by the roulette wheel, the dealer will place a marker, also known as a dolly, on that winning number on the roulette table layout. When the dolly is on the table, no players may place roulette bets, collect roulette bets, or remove any roulette bets from the table. The dealer will then sweep away all other losing roulette bets either by hand or rake, and determine all of the payouts to the remaining inside and outside winning roulette bets. When the dealer is finished making payouts, the marker is removed from the roulette board where players collect their winnings and make new bets. The winning chips remain on the roulette board.