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| Allegro CL

| ANSI Common Lisp 13 Characters 13.1 Character Concepts 13.1.4 Character Categories ### 13.1.4.1 Graphic Characters 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 2.1.3 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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