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Centimetre
A centimetre (the American spelling is centimeter, symbol cm) is a unit of length in the International System of Units (SI) measurement system. It is equal to one hundredth of a metre. Centi is placed in front to say 'a hundredth'. The centimetre is the base unit of length in the old centimetregramsecond (CGS) system of units.
The centimetre is usually used to measure things that are too big for millimetres but too small for metres. A centimetre is close to the length of a fingernail.
Contents
Similarities to other units of length
1 centimetre is equal to:
 10 millimetres
 0.01 metre (1 metre is equal to 100 centimetres)
 about 0.393700787401575 inch (1 inch is equal to 2.54 centimetres) ^{[1]}
1 cubic centimetre is equal to 1 millilitre, under the SI system of units.
Uses of centimetre
The centimetre is also used:
 sometimes, to measure how much rain has fallen into by a rain gauge ^{[2]}
 in maps, centimetres are used to change from map scale to real world scale (kilometres)
Unicode symbols
The centimetre has Unicode symbols so it can be written in Mandarin Chinese, Japanese and Korean characters. ^{[3]}
 centimetre (㎝)  code 339D
 square centimetre (㎠)  code 33A0
 cubic centimetre (㎤)  code 33A4
They are placed into one character, and it is mostly used with East Asian fonts.
References
 ↑ Inch  from Eric Weisstein's World of Physics
 ↑ Rain Measurement, Rain Gauge, Wireless Rain Gauge, Rain Gage, Rain Gauge Data
 ↑ [1] CJK Compatibility excerpt from The Unicode Standard, Version 4.1.
 CJK Compatibility excerpt from The Unicode Standard, Version 4.4 and coexterior users.

