There are only so many two-character combinations, the registries stopped releasing them long ago, and the ones in circulation move quietly between buyers who understand what they are. 3V happens to carry meanings rather than being arbitrary. In electronics it’s a supply voltage, standard shorthand on schematics and datasheets, which gives it an immediate home in hardware, power and embedded systems. In business writing the three Vs are volume, velocity and variety, the old framing for big data.