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Some basic info about USB
(lemmy.world)
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this post was submitted on 09 Sep 2024
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Blue is a convention to indicate USB 3. Of course, not everyone actually implements that, and USB-C ports don't, as far as I know, do that at all, just USB-A.
My current desktop does both -- the case has USB ports on the top that come off a USB header from the motherboard, which have a simple number "3.0" pointing at its USB-A ports in front, but uses black plastic for them. The motherboard's USB connectors in back use the "blue plastic" convention on its USB-A 3 ports, and black plastic on its USB-A 2 ports. The motherboard also labels the USB 3 ports by having a text label reading "USB 3.2", which isn't listed on OP's set of symbols, and puts symbols on them.