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In a BDSM context, a collar is a device of any material worn by a person around the neck to indicate their submissive or slave status in a BDSM relationship. A person wearing a collar to symbolize their relationship with another is said to be collared. Some people conduct formal "collaring ceremonies", which are regarded as effectively solemnizing their relationship in a similar way as a marriage ceremony and the collar having similar significance as a wedding ring. The standard form of a collar is a black leather band around the neck, often with metal D-rings added to allow the attachment of a leash, rope or other restraints. Some people may wear an ordinary choker or jewellery necklace instead.
Collars may be used in role-playing games involving erotic humiliation because they have connotations of control and pet-like status, especially when worn with a leash.