It would depend on the context.
Yes. The approved symbol for grams is just the lower case g, but some places not entirely comfortable with the SI-units sometimes use gm as an abbreviation.
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Lab is the abbreviation for Laboratory.
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abbreviation for grams is g
The abbreviation for gram is gm. and the symbol is g. Gram is short g.
The abbreviation for pressure is p
The abbreviation for desity is g/ml.
P
P
g
G
A can be an abbreviation for 'absent', 'ampere' and P can be that for 'Paid', 'Penny' etc.
The 'p' is an abbreviation of pence.
P-waves
g/mL or g/cm3