Wow, those dimensions are a bit cryptic...
I'd decpher the first one as:
Pine, actual 0.75 inches by 5.5 inches, of length 96 inches.
The 'NOM' I take to mean 'nominal' - what it's called in the timber yards (ie, a 1x6 plank that's 8 feet long).
Converting the 'NOM' values to metric that becomes 25mm x 150mm x 2400mm.
Welcome to the world of construction, where actual (real world) measurements do not match what's on the plans.
Cheers,
V.
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