Islam's central belief is the oneness of God, known as Allah. Major practices include daily prayers performed five times a day, fasting during Ramadan, and visiting mosques for worship. Mosques and the Kaaba in Mecca are sacred places. Symbols of Islam include the star and crescent and Shahadatain. Special celebrations are held for births, Eid-ul-Fitr after Ramadan, and Eid ul-Udh-ha during the hajj pilgrimage.