British vehicle registration for Carlisle
• (or 2H) double hard (on pencils; indicating very hard lead)
• international civil aircraft marking for Haiti
• British fishing port registration for Harwich
• Chem. , Physics heavy hydrogen
• Astronomy Herbig-Haro (in HH object )
• (Member of the ) Hesketh Hubbard Art Society
• His (or Her) Highness
• His Holiness (title of the Pope)
• His (or Her) Honour