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.