Po2

Po2, pO₂, PO₂, or PO2 may refer to:

A military rank:
- Petty Officer 2nd Class in the Canadian military
- Petty Officer Second Class in the United States military
Polikarpov Po-2 or U-2, a Soviet aeroplane
Partial pressure of Oxygen, that is, amount of oxygen in the blood (normally referred to as Dissolved Oxygen)
PO₂: Phosphorus dioxide, a gaseous free radical that plays a role in the chemiluminescence of phosphorus and phosphine.
Po²⁻: Polonide anion
a power of two in mathematics

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