What does Puo stand for?

- A Purine Nucleoside - Also, R

Placed under Observation - Medicine

Pneumonia (SAUS)

Princeton University Observatory - New Jersey

Prudhoe Bay - Arkansas - Airport symbol (OAG)

Prudhoe Bay, AK - Location identifier - FAA (FAAL)

Puoc - Language code (ETLW)

Put Under Observation (SAUS)

Pyrescia of Unknown Origin

Pyrexia - fever of Unknown Origin - Commonly called Trench Fever