symbols, acronyms & abbreviations

µL

microliter: micro- + liter. Used without a period. A symbol in SI, the International System of Units.

The symbol L was adopted in the United States (as an alternative to "l") to avoid confusion between the numeral "1" and the lowercase letter "l", since these characters are the same or very similar in many fonts, including typewriting. "L" was approved as an alternative symbol by the CGPM in 1979 (Resolution 6).

Metric System of Measurement; Interpretation of the International System of Units for the United States.
Federal Register Dec. 20, 1990. (55 FR 522 42-522 45).

American National Standard ANSI/IEEE Std 268-1982, Metric Practice.

Barry N. Taylor, ed.
The International System of Units (SI) pdf logo
NIST Special Publication 330, 2001 Edition.

The United States version of the English text of the seventh edition (1998) of the International Bureau of Weights and Measures publication Le Système International d’Unités (SI), including Supplément 2000: additions et corrections à la 7e édition (1998) See Section 2.1.2 and table 1, page 9 (for base units), and Section 2.2.2 and table 3, page 11 (for derived units).

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