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.