its

determiner1

1. •
   showing that something is related to a thing or animal already talked about, for example by belonging to that thing or animal, used before a noun

   • The manner wherewith our Lawes assay to moderate the foolish and vaine expences of table-cheare and apparell, seemeth contrarie to it's end. — 1603

pronoun1

1. •
   The one (or ones) belonging to it.

   • … both Houses have resolved to rob the North of a good friend of its and yours. — 1645

noun2

1. •
   Initialism of intelligent transportation system.
2. •
   Initialism of issue tracking system.