It can mean a variety of things depending on the context PO is used in. Since you have put this in the health category my best guess would be the medical term per os meaning "by mouth".
In chemistry Po stands for Polonium
Post Office!!
ganda ko tlagah ... diana lan po ..
The Police Department is usually abbreviated PD.
Put Outs
Aluminum, Germanium, Antimony, and Polonium are what Al, Ge, Sb and Po stand for on the periodic table.
Very simple: the chemical symbol is from the first two letters of the name.
PO on a prsescription stands for by mouth.
Post Office!!
Depending on the context, PO usually means either post office, postal order, or personnel officer. PO in a medical context means "per os" which is Latin for "by mouth." Doctors often use this abbreviation when writing a prescription, such as "take 25 mg PO at bedtime."
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