What is a unit of measure?

What are abbreviations for units of measure?
g  = grams(1)
mg = milligrams(1)
mcg = micrograms(1)
mg NE = milligrams of niacin equivalents(1)
mcg DFE = micrograms of dietary folate equiavelents(1)
mcg RAE = micrograms of retinol activity equivalents(1)
IU = international units (1)

Resources
1. https://www.fda.gov/media/135301/download

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