There is none. A single apostrophe is used to indicate feet, and a double for inches. To avoid any possible confusion, apostrophes are not used for metric lengths.
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There is 15 centimeters in 15 centimeters
There are 10 centimeters in 10 centimeters.
2 centimeters is just 2 centimeters, and 2 centimeters squared is 4 centimeters. 2 centimeters x 2 centimeters = 4 centimeters squared = times 2
15 centimeters = 15 centimeters
1 meter = 100 centimeters(1 meter + 64 centimeters) = (100 centimeters + 64 centimeters) = 164 centimeters