Floor

Dungeon features
Air	_ Altar
# Corridor	# Cloud
#. Drawbridge	+-| Door
. Doorway	{ Fountain
| Headstone	.  Floor
>< Ladder	. Ice
# Iron bars	} Lava
} Moat	# Sink
Solid rock	>< Staircase
\ Throne	^" Trap
# Tree	- | Wall
~ Vibrating square

Floor, ., is the most common type of terrain in NetHack. It imposes no special restrictions on the player, allowing you to move freely. Most rooms generate with ordinary floor, with a few exceptions such as swamps. Floor is also typically found throughout special levels.

Corridors are similar to floors, but they are typically dark and outside of rooms.

You can turn on the dark_room option in order to make lit floor spaces render on the map even when they are out of your line of sight.