A slot is a member function that can receive signals from other functions. Together with signals, slots make up a powerful component programming mechanism in Qt. Unlike signals, slots do not affect the state of an object.

A narrow notch, groove, or opening, as a keyway in a piece of machinery or a slit for a coin in a vending machine.

In video poker, a slot is an area on the screen that holds one or more cards. A player can place a bet into the slot and then spin the reels to try to create a winning combination. Many video slots also allow players to adjust the number of paylines they play, increasing or decreasing their chances of winning.

The slot in hockey is the area directly in front of the goaltender and between the face-off circles in the offensive zone. It is a prime location for wingers and centers because it allows them to rip a blistering slap shot with a clear view of the net. This is why many goalies assign a nickel back or slot corner to defend against these speedy receivers.

Some experimental studies suggest that visual feedback correlated with near misses may have a reinforcing effect on gambling behavior. In particular, Strickland and Grote found that participants who saw more near-misses than far misses were more likely to continue playing a slot machine simulation. However, a subsequent study by Reid did not find a similar effect.