+ISO 216 establishes the international standard for [Paper](/wiki/paper) sizes, notably the A and B series. Its elegant design ensures each sheet maintains a consistent [Ratio](/wiki/ratio) when folded or cut, starting with A0 at one square meter.
+## See also
+- [A4](/wiki/a4)
+- [DIN 476](/wiki/din_476)
+- [Metric System](/wiki/metric_system)