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

Question

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.
choose one

Answer 1

It means "migration" and marks the beginning of the Muslim Era.