vertical speed indicator (VSI)

instantaneous vertical speed indicator / instantaneous vertical-speed indicator (IVSI)

vertical gyro indicator

vertical scale indicator

hovering and low-speed indicator

rate of descent (ROD) / vertical speed

vertical speed (rate of climb, ROC)

vertical speed (rate of descent, ROD)

Numerical readout of vertical speed

supersonic speed (exceeds speed of sound / Mach 1)

variable-speed with speed control

Nr gauge (Nr = speed of rotation) / rotor speed sensor

Motor PWM speed separated from PID speed

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

turbine inlet temperature indicator

counter indicator

gyroscope course indicator scale

zone-beat indicator

fire extinguishing system indicator disc

slave indicator

indicator sight glass window