A character literal is formed by enclosing one of the 95 graphic characters (including the space) between two apostrophe characters. A character literal has a value that belongs to a character type.
character_literal ::= 'graphic_character'
'A' '*' ''' ' '
References: character type, graphic character, literal, space character.
Rationale references: 2.1 Lexical Structure
Style Guide references: 3.2.5 Constants and Named Numbers
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