Kippah
Updated: Wikipedia source
A kippah (pl. kippot), yarmulke, or koppel is a brimless Jewish skullcap, usually made of cloth, traditionally worn by Jewish men and sometimes women to fulfill the customary requirement that the head should be covered. It is the most common type of head-covering worn by men in Jewish communities during prayers and by most Orthodox Jewish men at most other times. Among non-Orthodox Jewish individuals, some wear them at most times, while most wear them only during prayer, while attending a synagogue, or at other ceremonies, and others wear them rarely or never.