The common letter-sized paper used in Europe and in most locations outside of North America. At 8.3 x 11.7" (210x297mm), A4 paper is slightly narrower and a little longer than "A" size 8.5 x 11 ...

The paper sizes we know and love, such as the trusty A4, the time-honored A5 and the extra-as-fuck A1, were developed by the International Organization for Standardization in Switzerland.

All submissions to the Calcutta HC contained in petitions, affidavits and applications will now have to be printed on white A4-size executive bond papers instead of the green or embossed papers ...

It's called the "A4 challenge" after the standard paper size that's just 21cm (8.3in) across. Critics - and there were many online - say the challenge, like other similar trends before it, could ...