A crown was a piece of headdress usually worn by a monarch.

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An important Klingon artifact was the Emperor's Crown. (DS9: "The Sword of Kahless")

In 2268, Garth of Izar performed his own coronation as "Master of the Universe", which included a crown. According to Garth the crown wasn't impressive by itself, but would act as a symbol around which his followers could rally. (TOS: "Whom Gods Destroy")

Sometime prior to 2369, Vash stole the Crown of the First Mother, an artifact from the planet Myrmidon. (DS9: "Q-Less")