Scanning is an important part of the Reaper's Game, as it allows Players to read the thoughts of Realground people. It can also help to identify Players and Reapers, as they are the only ones who can't be scanned. Scanning also reveals the presence of Noise and Taboo Noise.
In all cases, scanning is done through the use of the Player Pin, which is standard for all Players.
See also » Memes