Kicker
The second card in your hand, that doesn’t contribute to the hand’s rank. For example, if you hold QQ943, you have a pair of queens with a nine kicker. Five-card hands (straights, flushes, and full houses) don't have kickers. Kickers are especially important in games with community cards, as it's quite likely that two players could end up with similar hands. For example, if you hold A8 and someone else holds A7, and the flop is AK642, you have your opponent out-kicked. Your hand is AAK86, while theirs is AAK76.