fuel quantity indicator

fuel quantity transmitter

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

quantity-distance principle

subcritical quantity

supercritical mass / quantity

militarily significant quantity

gasoline quantity gauge

substantial change of a hydrodynamic quantity

substantial derivative of a hydrodynamic quantity

electromagnetic quantity

local change of a hydrodynamic quantity

local derivate of a hydrodynamic quantity

material change of a hydrodynamic quantity

material derivative of a hydrodynamic quantity

initial quantity order

fuel level indicator

fuel pressure indicator

fuel remaining indicator

Proton Exchange Membrane Fuel Cell (PEM fuel cell, PEMFC)

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