Akademik

PSF
noun
a terrorist group of radical Palestinians who split with al-Fatah in 1967 but now have close relations with al-Fatah; staged terrorist attacks against Israel across the Lebanese border
Syn: ↑Popular Struggle Front
Topics: ↑terrorism, ↑act of terrorism, ↑terrorist act
Regions: ↑Syria, ↑Syrian Arab Republic, ↑Lebanon, ↑Lebanese Republic
Instance Hypernyms: ↑terrorist organization, ↑terrorist group, ↑foreign terrorist organization, ↑FTO

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abbreviation
Usage: often not capitalized
pounds per square foot

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pounds per square foot.
Also, p.s.f.

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p.s.f. or psf (no periods),
pounds per square foot.

Useful english dictionary. 2012.