Definition
An instrument display that presents information using continuously variable physical indicators — typically a moving pointer (needle) sweeping across a fixed scale or dial face — so the value is read by the position of the pointer relative to the marked graduations.
Plain English
A gauge with a needle that moves around a dial. You read the value by looking at where the needle is pointing on the scale.
Context Anchor
Seen on traditional cockpit instruments such as airspeed indicators, altimeters, engine gauges, and attitude indicators.
Derivation
From the word 'analog,' meaning something that varies smoothly in proportion to what it represents. The needle's position is an 'analog' of the actual quantity being measured — as the value rises or falls, the needle moves in step with it.
Why Pilots Care
Analog displays let a pilot grasp trends at a glance — whether a value is rising, falling, or stable, and how close it is to a limit — without having to read and interpret numbers. This is why many primary flight instruments still use analog-style presentations even on modern glass cockpits.
Analogy
A round wall clock with hands is an analog display. You read the time by the position of the hands, not just by printed numbers.
Intuition Check
Analog does not simply mean old-fashioned or less accurate. Here it means the information is shown by continuous position or movement on a scale.
Example Sentence 1
The airspeed indicator's analog display made it easy to see the needle creeping toward the yellow arc as the aircraft accelerated in the descent.
Example Sentence 2
Many pilots prefer the analog display of the attitude indicator for its smooth representation of pitch and bank.