With the potential for large financial rewards, slot machine jackpots are an important part of casino gaming. The machine's reels usually display particubatery.betlar symbol combinations that activate these jackpots. Depending on the game & casino, jackpot amounts can range widely, from a few thousand dollars to more than a million dollars. Progressive jackpot systems, in which a percentage of each wager adds to an expanding prize pool, are found in many casinos.