see|Appendix:Variations of "ao"
See the Wikipedia article w:ISO 216|ISO 216, the international standard on paper sizes.
- The base size in the series of the international standard. Set such that it has an area of 1 square metre, where the ratio between the width and the length equals square root of 2. The width of each size is equal to the length of next smaller size.
#: dimensions: 1189 x 841 mm (1189.21 x 840.90 mm)