Term: Blindsight

Blindsight is a special kind of sight that allows one to see even if they are incapable of sight otherwise. Something akin to Improved Darkvision that also negates the Concealed, Invisible, and Obscured conditions outright (no save or check needed).
It does not stack with other forms of sight, often restricted to a Radius-like aura.
The Rule: Vision, Hearing, and Other Senses page will have full details for this and other sensory types.