Feel command

If no target or object is given, you will feel around your current environment. If you specify a target (which could be another player, an NPC, an object in the room, or something mentioned in the description of the room), you will touch that target, feel it, and examine it more closely.

Feeling around your environment includes paying more attention to the air, light, and other things that surround you. In a dark room, feeling around also allows you to search for exits.