Awareness

Awareness is a perk in Fallout, Fallout 2, Fallout 4 and Fallout Tactics. It is also a skill that was to appear in the canceled Fallout: Brotherhood of Steel 2, skills in this game work like perks do in other Fallout games.

Fallout, Fallout 2, and Fallout Tactics
Shows the HP, equipped weapon, ammunition type and ammunition count of any characters, creatures and robots when examining them.

Fallout 4
While this will reveal resistances for an enemy (in addition to a crossed-out symbol for immunities) it will not display any special characteristics. The main example of this is that ghouls are listed as having 1000 radiation resistance, when in truth they have a special effect that lets radiation damage heal them, making the resistance moot.

Fallout: Brotherhood of Steel 2
The player character acquires the strange ability of making creatures temporarily turn away from them, although done so with varying % of success.