Estimated Position Uncertainty. A measure of the current estimated navigational performance. Also referred to as Actual Navigation Performance (ANP) or Estimated Position Error. Note: The RTCA DO-236 Term is Estimated Position Uncertainty or EPU.

the motto appearing on most U.S. coinage. Roughly translated from the Latin to mean "From Many, One."

Emergency power unit (not for propulsion; on board of aircraft)

Enforcement Policy Unit

Emergency Planning Unit

European Payments Union.