Jerimiah got the ISO’s mark on their arm. Sadly Jerimiah may have to wait a few years before they come up with glowing implants, but this’ll do for now I think.
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That's actually the mark for a female ISO. D'oh!
They do have black-light reactive ink now… it glows nicely when put under a black light.
The symbol in their arm represents their gender. The female ISO symbol is a hexagon, followed by a "T" shape, while the male ISO symbol replaces the cross with a sideways "V" shape. In TRON: Evolution – Battle Grids the male/female choice is distinguished by each of these symbols.