button-head

penetrating head injury / open head injury

drop head body (drop-head body)

head-to-head flyoff

alarm button

button up

lapel button / insignia / miniature

magazine catch button

panic button

fast slave button

feed-pawl lifter button

focus button

slave button

button switch

button-rifling

choke button

elevation button

heater button

horn button spring

push-button control

starter button

button / press key

press key / button

lapel button

ident button

fire-control button

firing button

case head

cylinder head

general purpose head

head count (headcount)

head harness

head injury criterion (HIC) (med.)