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."
Post office
"H" is not universal legal shorthand for anything. It depends on the context.
The triangle in shorthand means "therefore"
against
Wut is a shorthand way of saying what.
FAX is shorthand for facsimile.
I am 85% sure it is STD, but I am not 100% sure.
In chemistry Po stands for Polonium
PAX in the tourism industry is shorthand for passengers.
The legal symobol used for plaintiff is the greek symbol for Pi (π). Likewise, the symbol used to represent defendant is the symbol for Delta (Δ).
RMAD is a common shorthand for the "Real Madrid" club (Real MADrid).
Is the vebatim shorthand reporting method used primarily to record legal proceedings.
"BBY" is often used as shorthand for "baby." It is a term of endearment used in informal communication.