ix
WIKIMEDIA DISAMBIGUATION PAGE
IX; Ix (disambiguation); I.X.; I.x.; Ix.; IX (disambiguation); I X; IX (album)
This word is a solution to that annoying problem that your English teacher stuck you with.
It is a third person singular gender-neutral pronoun.
Contrast with: Each child played with his/her toy.
Each child played with ix toy.Each person had the chance to air ix complaint.