I hate the use of SBC for Single Board Computer. First, the acronym is already in wide use for Session Border Controllers. Second, most PCs are single board computers (just a motherboard), so the name is meaningless.
ThrowawayR2
The "single board computer" meaning of SBC dates back to the mid-1970s when microprocessors first started coming out. Whatever a session border controller is, it's unlikely to pre-date that.