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" paper ...

Women on social media are showing how slim they are by comparing their waists to the width of a sheet of paper. They're calling it an "A4 waist," a reference to the A4 paper size, which is a little ...