He/she 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 he first instead of she can indicate a
preference for he, but this is not every case and can be the opposite or they can be equal.
Oh, Darell goes by he/she
pronouns. It means he can be called she or he.
Sometimes she prefers one over the other
as well.