Perception

Perception is the general ability to pick up on one's surroundings and notice anything of interest. It includes tapping into all the five senses, and some say those with a particularly powerful perception have been able to hone a sort of "sixth sense."

It is generally useful for detecting hidden characters and items, whether passively (when characters hide or perform stealth actions in the same room) or actively via the search command.

When detecting the actions of another character, it usually involves a skill check of the observer's Perception skill against the stealthy character's Stealth skill.