Ruby is the name of a Japanese electronic components company, which is Rubycon in English.

The capacitors produced by this company can all be called ruby ??capacitors.

The Black King Kong capacitor is a capacitor brand developed by Ruby Company, and its English name is Rubycon-BlackGate (BG). BG capacitors are the top brand of ruby ??capacitors.

I really don’t know that the answer above will be adopted by netizens. . . . Speechless. .