Dhu al-Hijja is the twelfth and last month of the Islamic calendar, and it is the time when Muslims from around the world gather in Mecca for the annual Hajj pilgrimage. There are several synonyms for Dhu al-Hijja, including Zul Hijjah, Dhu'l-Hijjah, and Thul-Hijjah. These variations all refer to the same month but are just different transliterations of the Arabic word. The month of Dhu al-Hijja is considered a sacred time for Muslims and is marked by fasting, prayer, and pilgrimage. It is a time for reflection, forgiveness, and strengthening of faith. Muslims around the world observe the month with devotion and reverence.