In BDSM, Master is one of the honorifics some people use to describe the dominant partner or "owner" in a Master/slave relationship. Because it is an honorific of the dominant form, it is usual for it to be written with a capital letter. It might also be used by the submissive partner as an honorific term in a D/s relationship. This can cause confusion when trying to understand BDSM terminology as both "Master" and "slave" might be used - as terms of endearment - even though neither consider themselves to be owned nor owner.