Characters that are classified as graphic , or displayable, are each associated with a glyph, a visual representation of the character.
A graphic character is one that has a standard textual representation as a single glyph, such as A or * or =. Space, which effectively has a blank glyph, is defined to be a graphic.
Of the standard characters, newline is non-graphic and all others are graphic; see section Standard Characters.
Characters that are not graphic are called non-graphic .
Non-graphic characters are sometimes informally called "formatting characters" or "control characters."
#\Backspace, #\Tab, #\Rubout, #\Linefeed, #\Return, and #\Page, if they are supported by the implementation, are non-graphic.
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