Anyone know why ggplot2 calls opacity/transparency alpha?

Out of curiousity, does anyone know why ggplot2 chose to call opacity/transparency alpha? I had not heard of this term before, and it seems kind of unintuitive. But maybe there is a logic, I am unaware of??

It comes from the history of computer graphics where transparency is stored in an 'alpha channel'alongside red green and blue channels.

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