What are the difference of themself from themselves?

Answer 1

Singular / plural.

Mark, please serve yourself before the potatoes get cold.

Janice, Georgia, Alice, please serve yourselves before the potatoes get cold.

Answer 2

Themselves (plural)

Themself (singular) usually refers to an individual when gender is unknown.

Answer 3

'Themself' is a gender-neutral pronoun used for individuals who identify outside the gender binary, while 'themselves' is the reflexive pronoun used for plural subjects or to refer to one's own self.