Needle
In aviation, a needle refers to the pointer on an instrument that indicates a specific reading or value. Needles are commonly found on instruments such as the altimeter, airspeed indicator, and vertical speed indicator. The needle on an altimeter, for example, indicates the current altitude of the aircraft relative to a set reference point. The needle on an airspeed indicator indicates the current speed of the aircraft through the air. The needle on a vertical speed indicator indicates the rate of climb or descent of the aircraft. The accuracy and reliability of these instruments are crucial for safe flight operations.
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