A chapeau is a flat-topped

hat A hat is a head covering which is worn for various reasons, including protection against weather conditions, ceremonial reasons such as university graduation, religious reasons, safety, or as a fashion accessory. Hats which incorporate mecha ...

once worn by senior clerics.

In heraldry

In European

ecclesiastical heraldry Ecclesiastical heraldry refers to the use of heraldry within Christianity for dioceses, organisations and Christian clergy. Initially used to mark documents, ecclesiastical heraldry evolved as a system for identifying people and dioceses. It ...

, it is used as a mark of

ecclesiastical {{Short pages monitor