All products at IFI (VEX, Hexbug, Rack Solutions) are sold under 7-digit part numbers, with the first three digits being a company + product line prefix, with the last four being a unique product ID.
VEX was assigned all 2xx-yyyy part numbers.
Since I was the technical lead on the development of the VEX IQ product line, all VEX IQ products are 228-yyyy part numbers as an homage to my former FRC Team 228, GUS.
VEXpro being 217- was based upon Paul Copioli being from FRC 217.
The VEX 123 248- prefix was based upon the ME on that project being from FRC 148.
VEX GO being 269- was based upon our ME and sales connections to VRC Team 169 and FRC Team 269.
VEX EDR / V5 being 276- has no FRC connection and was merely inherited from RadioShack.