Pronouns are things like he and she that are used in everyday language. A person who uses they/them/theirs/themself likes to be referred as those things in conversations. Someone may use other pronouns alongside those, such as he/they, she/they, or any neopronouns.
This is the flag for those who use it/its pronouns. An individual who uses it/its uses those pronouns in replacement for he or she. It/its is a form of neopronouns or exipronouns, neo means new and exipronouns are things like he/she/they and sometimes it pronouns.