License plate?

[RICKERMAN]

This may be a stupid question, or maybe insignificant, but, why do I see the same "license plate" number [ WSADDCT] displayed on SN95 Mustang t shirts from many different artists or manufacturers?
Is there anything significant about the number. "WSADDCT "?

 

[NEURON]

ADDCT is short for addiction? WS maybe wise, nah. Not a clue lol.

 

[07GtS197]

Wheel spin addict, I guess it’s a brand.

 

[badass98svt]

Yeah, it's a bunch of shirts they sell. I miss the 2Kocky shirts. They were so much better.