The term wild card was originally used in card games, but the term has evolved to describe what the Merriam-Webster Dictionary calls "an unknown or unpredictable factor" in any number of domains.
Wild Card - a card placed on the wheel on the U.S. version of Wheel of Fortune. A player holding the card, who subsequently lands on a cash space and calls a consonant appearing in the puzzle, may turn it in for the chance to call a second consonant for the same cash value in the same turn, or to gain an extra consonant during the Bonus round puzzle.
Wildcard - A quarterly(ish) event in Leicester, exhibiting art, performance, film, music and the odd videogame.
Wild card spot - a semifinals berth given to a Jeopardy! tournament player who is one of the four high-scoring non-winners in the quarterfinal round.
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