What does the Hijra symbolize in Islam and what did it start?

It means "sacred" and marks the beginning of worshipping in mosques.
It means "prophesize" and marks the beginning of the sunnah tradition.
It means "divide" and marks the beginning of the Sunni-Shia split.
It means "migration" and marks the beginning of the muslim Era.

The Hijra symbolizes the migration of the Prophet Muhammad and his followers from Mecca to Medina in 622 AD. It marks the beginning of the Islamic calendar and the establishment of the first Muslim community. The Hijra is significant in Islam as it represents the beginning of a new era for Muslims and the spread of Islam as a major world religion.