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  ANSI Common Lisp   22 Printer   22.1 The Lisp Printer   22.1.3 Default Print-Object Methods Printing Characters

When printer escaping is disabled, a character prints as itself; it is sent directly to the output stream. When printer escaping is enabled, then #\ syntax is used.

When the printer types out the name of a character, it uses the same table as the #\ reader macro would use; therefore any character name that is typed out is acceptable as input (in that implementation). If a non-graphic character has a standardized name5, that name is preferred over non-standard names for printing in #\ notation. For the graphic standard characters, the character itself is always used for printing in #\ notation - even if the character also has a name5.

For details about the #\ reader macro, see Section Sharpsign Backslash.

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