The term "Hégira" refers to the migration of the Prophet Muhammad and his followers from Mecca to Medina in 622 CE. This event marks a significant turning point in Islamic history, as it led to the establishment of the first Muslim community and the beginning of the Islamic calendar. The Hégira symbolizes the struggle for religious freedom and the formation of a new social order based on Islamic principles. The Hégira is also known as the Hijra in Arabic, which means "migration." It is celebrated by Muslims as a pivotal moment that allowed the spread of Islam and the growth of its followers. The year of the Hégira, 622 CE, is considered year one in the Islamic lunar calendar, marking the start of a new era for the Muslim community.