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=== Written Tunnel Tongue ===
The physical aspect of tunnel tongue comes in the form of symbols carved into stone walls, often done by claws. These function similarly to [https://en.wikipedia.org/wiki/Braille braille]. Scratches of different angles or different depths can mean different things. More often than not, physical Tunnel Tongue is used to indicate safe tunnels, unsafe tunnels, tunnels rich in resources or work-in-progress pitfall traps. They've also been used as a way to help cats get around the depths. Even in recent time, apprentices are expected to learn the bare basics of tunnel tongue in order to navigate efficiently.