Today’s page is actually a Wiktionary page and not a wikipedia page but I hope that the reader can forgive me.
Xe is a gender neutral pronoun. It can be used in place of he. I really injoy the possessive (xyr or xir) and the reflexive (xyrself).
An example of when this is useful is when talking about the space pope. Xyr eminence would be a great way to address the leader of the intergalactic catholic empire. If that ever comes up.
For other gender-neutral pronouns there is another great page for it.