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.
Lab is the abbreviation for Laboratory.
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abbreviation for grams is g
The abbreviation for gram is g.
The abbreviation for gram is gm. and the symbol is g. Gram is short g.
H is the abbreviation on the table of elements. The 'chemical symbol' for hydrogen is H.
The abbreviation for primary waves is P-waves.
The abbreviation for phosphate is PO4.
P
The abbreviation for gallon is "gal."
The abbreviation for desity is g/ml.
g
The abbreviation for grams is "g."
A can be an abbreviation for 'absent', 'ampere' and P can be that for 'Paid', 'Penny' etc.