symbols, acronyms & abbreviations
liter Both L and l are approved by the CGPM as alternative symbols for the liter. In the United States, L is preferred, to avoid confusion with the numeral 1.
IEEE Std 260.1™-1004.
IEEE Standard Letter Symbols for Units of Measurement (SI Units, Customary Inch-Pound Units, and Certain Other Units).
Approved 22 July 2004, American National Standard Institute; approved 25 March 2004, IEEE-SA Standards Board.
New York: IEEE, 24 September 2004.
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Last revised: 20 May 2007.