OH

noun5

1. •
   Abbreviation of Ohio: a state of the United States.
2. •
   (Internet) Initialism of other half: a husband, wife, partner, etc.
3. •
   [plural only] Initialism of office hours.
4. •
   (Internet) Initialism of overheard; a post whose contents were overheard by its author.

   • OH: "We should just burn the whole place down"
5. •
   (US) Initialism of observation helicopter.