symbols, acronyms & abbreviations



fluid, as in fluid ounce, “fl oz”, fluid pint, “fl pt”, and so forth. Occurs with and without a period.


femtoliter: femto- (an SI prefix meaning 1 quintillionth) + liter. Used without a period. A symbol in SI, the International System of Units.

Barry N. Taylor and Ambler Thompson, editors.
The International System of Units (SI) pdf logo
NIST Special Publication 330, 2008 Edition.

“United States version of the English text of the eighth edition (2006) of the International Bureau of Weights and Measures publication Le Système International d’ Unités (SI)” This publication is the definitive guide for the United States, but the ultimate authority is the original, French version. For the symbol for femto-, see page 29, and the liter, page 32, especially footnote f.

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