包括用于信息交换的ISO 7位编码字符集（ISO 646）第0列和第1列的控制字符的两种图形表示模式:a）一组需要单个字符的特定符号，用于图形表示这些通常不打印的字符；b） 一组字母数字表示，包括从ISO 7位表中使用的缩写中导出的两个字符。还为通常不打印的字符SPACE和DELETE提供图形表示。

Includes 2 modes of graphical representations of the control characters of columns 0 and 1 of the ISO 7-bit coded character set for information interchange (ISO 646): a) a set of specific symbols requiring a single character for graphical representation of each of these normally non-printing characters; b) a set of alphanumeric representations comprising two characters derived from the abreviations used in the ISO 7-bit table. Also provides graphical representations for the normally non-printing characters SPACE and DELETE.