детонометр
instantaneous vertical speed indicator / instantaneous vertical-speed indicator (IVSI)
knock a tank
audible knock
big-end knock
borderline knock curve
engine knock / knocking
high-knock rating gasoline
knock detection by ear
knock off balance
knock tendency
knock test of gasoline
knock-down power
knock-free operation
knock-meter
knock characteristic (of gasoline)
knock-free fuel
knock-down fence
knock out of action
knock out of the war
air-flow indicator
artificial horizon (gyro horizon/ attitude indicator)
desiccant indicator
gyro course indicator
indicator console
indicator lamp
indicator light
indicator system
performance indicator
radiac computer-indicator
range height indicator (RHI) scope
target indicator
telltale indicator