ISO/IEC 646 is the name of a set of ISO/IEC standards, described as Information technology — ISO 7-bit coded character set for information interchange and developed in cooperation with ASCII at least since 1964. Since its first edition in 1967 it has specified a 7-bit character code from which several national standards are derived.. ISO/IEC 646 was also ratified by ECMA as ECMA-6.

Where used, identifiers are composed of a delimiter (1 char, IS 1 of ISO 646) and an identifying code (1–9 chars, as defined in the leader), plus a variable length string containing the data. Example. MARC21 is an instance of ISO 2709 that has the following characteristics: tags are in the range 002–999 only

iso/iec 646は7ビットの文字コードを規定する国際標準化機構 (iso) 標準であり、これを元に各国語版の文字コードが規定される。. アメリカの規格であるasciiを国際化した体裁となっている。 ラテンアルファベット（iso基本ラテンアルファベット）と数字を中心とした共通部分と、asciiで …

ISO 269: Correspondence envelopes – Designation and sizes (Buste per la corrispondenza – forme e misure) del 1985, definisce una serie C per le buste. ISO 217: Paper – Untrimmed sizes – Designation and tolerances for primary and supplementary ranges, and indication of machine direction ... -5, -6) · 646 · 690 · 717 · ...