Hon.—Honorable.
H.P. or h.p.—Horse power.
H.R.H.—His (Her) Royal Highness.
I.—Island.
Ia.—Iowa.
Ib. or Ibid. (L. ibidem).—In the same place.
Id.—the same.
i.e. (L. id est).—That is.
I.H.S. (originally Gr. Iēs(ous); usually looked upon as standing for Jesus, hominum Salvator). Jesus, Saviour of men.
Ill.—Illinois.