Single Board Computer. Yes, it might help to explain such acronyms in the article. And yes, if you think the name is slightly misleading, I agree: most PC mainboards today are also "single board computers" - you don't have to add any additional cards to get a functional PC (unless you consider RAM modules and M.2 SSDs cards).
Maybe you should have search for "SBC abbreviation" instead, as it's not exactly a philosophical question. It's a TLA (spoiler: TLA stands for Three Letter Acronym).
SBC (single board computer) is a fairly widely used term.
