Kalimavkion

A kalimavkion (Greek: καλυμμαύχιον), kalymmavchi (καλυμμαύχι), or, by metathesis of the word's internal syllables, kamilavka (Russian: Камила́вка, romanized: Kamilávka), is a clerical headdress worn by Orthodox Christian and Eastern Catholic monks (in which case it is black) or awarded to clergy (in which case it may be red or purple).

In the Byzantine Empire the term kamelaukion (καμηλ(λ)αύκιον or καμιλαύκιον) was a more general one for formal headgear, including items worn by the imperial family.

The kalimavkion is a stiff cylindrical head covering, similar to a stovepipe hat but without a brim.

[1] The kalimavkion is worn during services; at other times, the softer skufia is worn in its place.

The specific shape and colouring will differ between the various ethnic traditions:

Greek Orthodox clergyman wearing clerical kalimavkion.