wild card

1 ENTRIES FOUND:
wild card noun
plural wild cards
wild card
noun
plural wild cards
Britannica Dictionary definition of WILD CARD
[count]
1 
: a playing card that can represent any other card in a game
2 
: a person or thing that could affect a situation in a way that cannot be predicted : an unknown or unpredictable factor
3 
sports : a player or team chosen to fill a place in a competition after the regularly qualified players or teams have all been decided
4 
usually wildcard : a symbol (such as ? or *) that is used in a computer search to represent any letter or number