The international standard

**symbol for inch**is in (see ISO 31-1, Annex A) but traditionally the**inch**is denoted by a double prime, which is often approximated by double quotes, and the foot by a prime, which is often approximated by an apostrophe. For example, three feet two**inches**can be written as 3′ 2″.Likewise, people ask, what is centimeters used to measure?

A centimetre (international spelling as used by the International Bureau of Weights and Measures; symbol cm) or centimeter (American spelling) is a unit of length in the metric system, equal to one hundredth of a metre, centi being the SI prefix for a factor of

**1100**.Are cm metric or imperial?

Most countries use the Metric System, which uses the measuring units

**such**as meters and grams and adds prefixes like kilo, milli and centi to count orders of magnitude. In the United States, we use the older Imperial system, where things are measured in feet, inches and pounds.