Well to be fair, it doesn't say exit on the sign. It just says 'you can run this way to find a white wall below this sign' - which is technically correct.
The footprints on the floor coming out of the wall makes this look like some sort secret hidden room where you’ll find an armour upgrade or something. Run up to it and hit the use button.
In this case nothing since I'm fairly certain this isn't in the US. Judging by the labels which all look like German it's most likely somewhere in Germany, although there's a couple nordic countries whose language is close enough to German that it could be one of those as well.