A jester's hat is called a "fool's cap" or a "coxcomb".
The name of a jester's hat is called a "fool's cap" or a "jester's cap." It typically features points or bells on its ends and is associated with jesters and clowns.
Look in the related links I will make for you below.
coxtoms Cockscomb...multiple points Coxcomb...adorned with a strip of red
Jesters were a type of clown in Medieval times who were expected to entertain court. Therefore they often had bright dress with a distinctive hat with many bells.
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It's called a foule- bordeau, also some times referd to as a cap n bells.
What we see of Yorick in the play is his skull, wearing no hat at all. Yorick died long before the events in the play Hamlet. But when he was alive he was "the king's jester" and so might have worn a jester's hat back then.
A Jesters' Staff
Newcastle Jesters ended in 2001.
Newcastle Jesters was created in 1996.
Digital Jesters was created in 2003.
A fool's costume in medieval times was called Motley.