roulette, (from French: small wheel ), gambling game in which players bet on which red or black numbered compartment of a revolving wheel a small ball (spun in the opposite direction) will come to rest within. Bets are placed on a table marked to correspond with the compartments of the wheel.

Generically, an animated graphic that shows something is being done is known as a 'throbber. ' The spinning wheel is formally a 'radial line throbber', but, as far as I can tell, it's known as the 'spinning wheel.