Candle – the light on the top of the machine, which flashes to inform the operator to bring change or to signal a problem. The light also flashes when the jackpot is hit as most slot machines are not able to pay out the whole prize and the players have to get part of it from the a casino employee. If the light signals a problem and you haven’t been paid your winnings, don’t leave the slot machine but wait for a casino representative to get your money.