What does the little bar code on slipknots clothes mean?

What does the little bar code on slipknots clothes mean?
i keep wondering what the little bar code means on their clothes. i tried researching it but i couldn’t find anything. does anyone know???

Best answer:

In the past, their jumpsuits have featured large UPC barcodes printed on the back and sleeves, which are identical and render the same barcode number to the barcode on their first demo, Mate. Feed. Kill. Repeat.