A joker is the common name for the representation of a medieval court jester or harlequin. A joker typically wears a floppy, multi-pointed hat made of cloth fabric with jingle bells at the tips of the points. The joker wears colorful clothing, laughs incessantly, and often holds a mock scepter known as a marotte in his hand.
The term joker is most often a reference to one of two special cards in an Anglo-American playing card deck that are used as wild cards.

Joker's Realm - Information on Batman's greatest foe.
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