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m stands for metres. This is always a lowercase m, an uppercase, or capital, M is the prefix Mega and means one million.

c stands for hundredth. this is always a lowercase c, an uppercase, or capital, C is the symbol for celsius.

cm stands for hundredths of a metre, and is pronounced centimetre.

Officially the prefix centi- is available for all SI base units, it is only used for metres, and this use is dieing out in favour of millimetres.

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13y ago

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