H.H. His (or Her) Highness.
HHD. Hogshead.
H.I.H. His (or Her) Imperial Highness.
HIST. Historian, History.
H.J., _hic jacet_=Here lies;--H.J.S., _hic jacet sepultus_=Here lies buried.
H.K. House of Keys (Isle of Man).
H.M. His (or Her) Majesty.
H.M.C. His (or Her) Majesty's Customs.
H.M.I.S. His (or Her) Majesty's Inspector of Schools.
H.M.P., _hoc monumentum posuit_=Erected this monument.
H.M.S. His (or Her) Majesty's Ship or Service.
HO. House.
HON. Honourable, Honorary.
HOR. Horizon; Horology.
HORT., HORTIC. Horticulture, Horticultural.
HOS. Hosea.
H.P. High-priest; Half-pay.
H.P. Horse-power.
H.R. House of Representatives; Home Rule.
HR. Hour.
H.R.E. Holy Roman Emperor or Empire.
H.R.H. His (or Her) Royal Highness.
H.R.I.P., _hic requiescit in pace_=Here rests in peace.
H.S., _hic situs_=Here lies;--H.S.E., _hic sepultus_ (or _situs_) _est_=Here is buried (or laid).
H.S.H. His (or Her) Serene Highness.
H.S.S., _Historiae Societatis Socius_=Fellow of the Historical Society.
HY. Henry.
IA. Iowa.
IA., IND. Indiana.
IB., IBID., _ibidem_=In the same place.
I.C.E. Institute of Civil Engineers.
ICH., ICHTH. Ichthyology.
ICON. Iconography, Iconographic.
I.C.S. Indian Civil Service.
ID., _idem_=The same.
I.D.B. Illicit Diamond Buyer (in Cape Colony).
I.D.N., _in Dei nomine_=In the name of God.
I.E., _id est_=That is.
I.H.P. Indicated horse-power.
I.H.S., for the Greek capitals I[=H]C, (the C a form of Greek [Sigma]), the first three letters of the name Jesus, often misread as _Jesus Hominum Salvator_=Jesus Saviour of Men.
ILL. Illinois.
ILL. Illustration, Illustrated.
I.L.P. Independent Labour Party.
IMP. Imperial; _Imperator_=Emperor.
IMP. Imperfect; Imperative; _Imprimatur_=Let it be printed.
I.M.S. Indian Medical Service.
IN. Inch, Inches.
INC., INCORP. Incorporated.
INCOG., _incognito_ (It.). Unknown, avoiding publicity.