I head engine

engine capacity / engine power, engine output

penetrating head injury / open head injury

drop head body (drop-head body)

head-to-head flyoff

reciprocating engine cylinder head

reaction engine / motor (jet engine)

rotary engine (Wankel engine)

engine ground run / engine test

engine oil reservoir / engine oil tank

case head

cylinder head

general purpose head

head count (headcount)

head harness

head injury criterion (HIC) (med.)

Head of Directing Staff (HDS) (exercises)

Head of Logistics

Head of Mission

head room

head wind

head-on approach

head-on battle

head-up display / heads-up-display (HUD)

high explosive antitank and antipersonnel head

high explosive antitank head

high explosive head

homing head

navigation head

pointed head

azimuth aiming circle head

camouflage head net (headnet)

passive electronic homing head