It's called a CCa:
All I know is what PZ has posted in the past. It is a constant-current output, so the output voltage adjusts itself automatically (within a limited range) to maintain a preset (or adjustable?) current value. This is supposed to overcome the variations in energy being delivered caused by variations in skin resistance, contact pressure, body chemistry, etc.
Generally speaking, constant current sources are less preferred (and less understood?) by contemporary engineering thinking, probably because the math is a bit more complicated than for constant voltage sources. OTOH, the standard telephone is a pseudo-constant-current device, which is why the volume in the earpiece varies so little between a house next door to the exchange and a house 3 miles away. Whenever the quality of the electrical connections is in question, cc outputs deliver more consistant performance than cv outputs.
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