She/him is a set of pronouns containing both the pronoun sets of she/her and he/him. It is used typically by people who identify as both masculine and feminine genders, but anyone who feels comfortable with them can use these pronouns if they fit you.

In some cases the person putting she first instead of he can indicate a preference for she, but this is not ever case and can be the opposite or they can be equal.

When you eat dirt for the first time and leave your family to build a shack in the woods