Use capital letters for the first letter of symbols that come from people’s names.

Small_OK Bq (becquerel)
Small_OK Hz (hertz)
Small_OK K (kelvin)
Small_OK N (newton)

Symbols that come from common nouns are generally written in lower case and are the same for singular and plural.

Small_OK cd (candela)
Small_OK g (gram)
Small_OK kb (kilobit)
Small_OK kg (kilogram)
Small_OK lm (lumen)
Small_OK lx (lux)

However, remember kilobyte (kB) (one kilobyte is equal to eight kilobits) and litre (L).

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