(Internet slang, text messaging) Abbreviation of hold on.

Alternative form of aitchbone

Alternative letter-case form of h/c.

Initialism of postage, processing and handling.

(motorsports) Initialism of motor generator unit, heat. (an energy recovery system; a motor generator unit which harvests thermal energy from the exhaust via the turbocharger)

Abbreviation of Hakadosh Baruch Hu.

Acronym of high school.

(US politics, law) Abbreviation of House Resolution; also H.Res.

(US, military, historical) Initialism of harassment and interdiction.

Alternative form of h bar