Ostensible Authority focuses on the legal principle of estoppel -- generally used to compel a person to do something or to forbid a person from doing/denying something (e.g., the principal denying the agent's authority to make certain representations or take certain action(s)). Estoppel is based on notions of "fundamental fairness" and "a court's power to achieve that fundamental fairness." The most proper legal term for both this "fundamental fairness" and a court's power to achieve that fairness is __________________________________. [HINTS: (1) You may answer thisQuestion with ONLY ONE WORD; you do not have to copy the entire sentence or give any explanation. (2) This Question seeks the name for the general category/label for this type of power/authority, which not all courts have.]