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.
1. Person: How old are u?
Person 2: I am 4 years old.
2. Four: Welcome to Dauntless