Chair is a Landmark in Battle Royale added in Chapter 2 Season 1, located inside the coordinate G4. As its name suggests, it is just a chair (a small red chair), on the summit of a hill. It can be destroyed. It has 0 Chests and no floor loot spawns
Chair may be a reference to the wooden chair at Outskirts from the Chapter 1 map, due to it at one point being only a chair when the rest Outskirts wasn't created yet.
This may hint that Chair may become part of a new POI in the future, although it may just be reference.