A skullcap is a small, round hat that fits closely on the top of the head. It is used by Muslims mainly used for prayer purpose and is also referred as a “prayer cap”. Skullcaps are also worn by religious Jewish men and high ranking Roman Catholic priests.
Taqiyah is the Arabic word for the Muslim cap used in Saudi Arabia. In Pakistan and India, the prayer cap is called a topi. Topi means cap in the Hindi/Urdu language. In Pakistan, men usually wear the topi with salwar kameez. In Bangladesh it's known as tupi.