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When writing the names of SI/metric units in full, capitalize only the word Celsius.
When using symbols, capitalize the 19 symbols based on personal names and the letter L for litre.
All the other symbols remain in lower case.
Capitalize the symbols for the prefixes from mega to yotta.
The symbols for the other prefixes remain in lower case. Consistency is important here because the letters m and p are both used in symbols for two different prefixes:
See also ABBREVIATIONS: INTERNATIONAL SYSTEM OF UNITS (SI).
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