is for ANALOG
An analog signal is a term regularly associated with bespoke engineering. It is most often thought of from an electrical perspective but is also relevant to mechanical, pneumatic and hydraulic systems.
It differs from a digital signal in as much as there can be significant, meaningful fluctuations in the signal. It also has a much higher density than a digital signal. Analog signals are used in a whole range of things from barometers to sound recording.
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