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letter symbol (for a quantity or a unit)
One or more letters written successively and without spacing, in a specified style and often provided with additional marks, by convention representing a quantity or a unit. (Ref. ANSI Y10.1 and IEC 27‑1.)
NOTE In a few special cases, nonalphanumeric signs are considered as letters in this connection, e.g., the sign ° (degree), which is used as a letter symbol for a unit of angle and in the letter symbol °C for a unit of temperature.
References
JESD77-B, 2/00JESD99B, 5/07
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