Quote Originally Posted by Cheesegear View Post
Typically by displaying this icon,

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very prominently on their person. Typically the mark (or some form of it) is branded onto them, sometimes on the forehead, but psykers slated for the Inquisition might have the brand on the sole of their foot or somewhere not-obvious. It's a symbol of graduation from the Scholastica Psykana, or validity that this psyker is both powerful and has undergone training and is safe. Very powerful ones typically carry a staff, the most powerful psykers are most obviously spotted by the fact that they've overcome the emaciating effects of using the Warp for extended periods.
Just a brand? That seems like it'd be easy enough to mimic. Why don't more Psykers just get a tattoo?