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If "Master/Slave" terminology in computing sounds bad now, why not change it to "Dom/Sub"?
(lemmy.dbzer0.com)
A "Showerthought" is a simple term used to describe the thoughts that pop into your head while you're doing everyday things like taking a shower, driving, or just daydreaming. A showerthought should offer a unique perspective on an ordinary part of life.
The master branch in git isn't the same though. It's closer related to the word "remaster." Master used to mean the original document is still used everywhere in tech and outside of it.
Main makes more sense since a master copy should be something that doesn't change in my opinion. But that's semantics...