(medicine) Initialism of patent foramen ovale.

(medicine, colloquial, slang) Initialism of pissed and fell over, describing an inebriated person who presents to the emergency department.

Abbreviation of perfluorooctane sulfonate.

plural of PFO

(organic chemistry) Abbreviation of perfluorooctanoic acid.

plural of Pfohl

A surname.

Abbreviation of perfluorooctanesulfonamide.

(finance) Abbreviation of payment for order flow, compensation that a broker receives for routing a customer order to a market maker.

A city and Stadtkreis in Baden-Württemberg, Germany.