What does this mean "Sexual Assault of a Child F4"?

Question

I found out that a s*x offender moved to the neighborhood. Specifically I want to know what the F4 means.

Answer 1

Female (child) 4 years old.

I stand corrected by moiahxp. He is right.

Answer 2

I think that F4 means what degree of sexual assault it is. It shows if you look it up that there are various types of F4 situations such as enticing young children.  

Answer 3

The F means that person is a high risk, level 4 and the amount of years they served or  years this crime carry.  

Answer 4

Means time to form a mob and get the filthy perv ran out of town.