The International System of Units (SI) specifies a set of seven base units from which all other units of measurement are formed. These units are called SI derived units and are also considered part of the standard.
The names of SI units are always written in lowercase. The unit symbols of units named after persons, however, are always spelled with an initial capital letter (e.g., the symbol of hertz is Hz; but metre becomes m). The exception is the Celsius, which refers to divisions on the Celsius temperature scale.
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