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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.
I've seen "Main" and "Secondary" be used exactly for this reason, as they keep the same first letter so don't require acronyms to be changed.
I've seen "Main" and "Support" be used likely for the same reason