Barcode Tattoo

The Barcode Tattoo is a strange tattoo that has appeared printed on the arms of several black, carapaced individuals in Homestuck.

The tattoo was first seen on the arm of the Wayward Vagabond, who refused to dwell on or explain the tattoo. It resurfaced yet again on the arm of Archagent Jack Noir, hinting at the tattoo, and the Vagabond, bearing a connection to the Dark Kingdom in which Jack resides.

The tattoo reappeared yet AGAIN on the arms of Spades Slick, Clubs Deuce, Hearts Boxcars, and Diamonds Droog. Slick was shown to be in posession of a card that explained the rules of Blackjack, and on the back of said card was yet another of the barcode tattoos, perhaps showing that the tattoos are somehow involved with the game of blackjack- a LIVING game of blackjack, if the fact that all the individuals with the tattoos on their arms are alive is anything to go on.

As of yet, it is not truly known what purpose they serve, why these people have the tattoos, et cetera, but of course that hasn't stopped speculation.