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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. The best ones are thoughts that many people can relate to and they find something funny or interesting in regular stuff.
Primary/secondary?
That doesn't make sense depending on the context. New I2C standard switched to controller/target for example. This conveys that one device is controlling the other devices.
i saw main/clone for storage once