Tudor bonnet
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A tudor bonnet (also referred to as a "round cap") is a soft round black academic cap, with a tassel hanging from a cord (both often gold in colour) attached to the centre of the top of the hat. It is mostly worn as part of academic dress by a person who holds a doctorate degree, mainly by those holding a research or professional doctorate degree. It is also often worn by those holding an honorary or full higher doctorate, and, at certain educational establishments, by University Officers, such as the Esquire Bedell, University Marshal, the President of the Students Union, and Members of the University Council.
In some educational establishments, or some faculties of some educational establishments, a mortar board is worn instead.