The following abbreviations and none other may be employed in the required net quantity declaration:
Inch-in.
Feet or foot-ft.
Fluid-fl.
Liquid-liq.
Ounce-oz.
Gallon-gal.
Pint-pt.
Pound-lb.
Quart-qt.
Square-sq.
Weight-wt.
Yard-yd.
Avoirdupois-avdp.
Cubic-cu.
16 C.F.R. §500.22
Periods and plural forms shall be optional. Exponents are permitted.