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Ok faggots let me explain
When you hike the Appalachian Trail there are shelters for the Through-Hikers to stop and rest and sleep in. They can be anything from a raised tent platform or lean-to in the south to a enclosed hut in the north.
Inside these shelters are usually notebooks for hikers to leave notes, info and other discussion for other hikers. Could be location of water, berries, ect. When you write in them, some hikers use trail names to sign