1. A number that comes after 3, and before 5. Duh.
2. A character from the blockbuster series "Divergent"(In my opinion, the best). In the
book, he is Tris Prior's instructor in Dauntless (one of the factions in the city) initiation, but as the
book goes on he eventually falls in love with her. His
name is then found out to be Tobias Eaton, but his nickname is Four because he only has four fears; heights, confinement, shooting an innocent person, and his
father abusing him. He is portrayed by Theo James (<3) in the movie released on March 21st in USA, April 4th in UK.