Appllies to trimmed sizes of paper for administrative, commercial and technical use and to printed matter such as forms and catalogues, and does not necessarily apply to newspapers, books, posters etc.
ISO 216:1975 history
2007ISO 216:2007 Writing paper and certain classes of printed matter - Trimmed sizes - A and B series, and indication of machine direction
1975ISO 216:1975 Writing paper and certain classes of printed matter; Trimmed sizes; A and B series