U.S. Code of Federal Regulations

Regulations most recently checked for updates: Aug 27, 2025

§ 129.3 - Abbreviations.

The abbreviations used in this part represent the following terms:

lb = pound (or pounds) g = gram µg/l = micrograms per liter (1 one-millionth gram/liter) kg = kilogram(s) kkg = 1000 kilogram(s)