symbol 

in quantities and units
https://doi.org/10.1351/goldbook.S06210
Conventional sign designating a quantity or a unit of measurement.
Notes:
  1. Symbols for quantities are denoted by letters of the Latin or Greek alphabet printed in italic (sloping) type; pH is an exception.
  2. Symbols for units are denoted by letters of the Latin or Greek alphabet printed in roman (upright) type.
Source:
PAC, 1996, 68, 957. (Glossary of terms in quantities and units in Clinical Chemistry (IUPAC-IFCC Recommendations 1996)) on page 995 [Terms] [Paper]
Citation: 'symbol' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. https://doi.org/10.1351/goldbook.S06210 RIS BibTex EndNote
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Last revised: February 24, 2014