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B+ is basically a universal electronics term for the power supply voltage(s).
It dates back to the tube battery radio era. Back then the heaters would be powered by an A battery, the plates would be powered by a B battery and the grids would be biased by a C battery. Eventually they figured out how to make the B battery bias the grids with resistors, then they figured out how to make AC power supplies do the work of batteries (causing battery radio bonfires in many cities in the late 20s), but the A and B designations stuck...A fell out of use with the transistor and certain solid state devices started using VCC, VDD, VBB and or supply design voltage as designations, but B+, and B- are still in common use, and far from dead.
Your useless trivia lesson for the day...
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