Looking again at the explainthatstuff.com QR code up above, we have: 1  Quiet zone: An empty white border that makes it possible to isolate the code from among other printed information (for example, on a dirty envelope, among the black and white print of a newspaper, or on smudged product packaging).
Valid units must be of the length type. âºâº Definition: Centimeter. A centimetre (American spelling centimeter, symbol cm) is a unit of length that is equal to one hundreth of a metre, the current SI base unit of length. A centimetre is part of a metric system. It is the base unit in the centimetre-gram-second system of units. A corresponding unit of area is the square centimetre.
The centimeter (British spelling: centimetre, abbreviation and symbol: cm) is a unit of length in the SI system (metric system). One cm is equal to one hundredth of the meter (British spelling: metre), which is the current SI base unit of length. One centimeter = 0.01 meter = 0.1 decimeters = 0.00001 km = 0.393700787401 inch = 0.032808399 feet = 0.010936133 yards.