Avail is only concerned with character value, not meaning or transcription. A character is always equal to itself and always unequal to another character. Characters are immutable and possess but a single intrinsic property: Unicode code point. Unicode is an international standard for the codification of all widely used characters. A code point is a numeric value that is uniquely associated with a character relative to some system of codification. Thus a character's Unicode code point singularly identifies it within the Unicode scheme.
A character literal is expressed as a cent sign
¢ (U+00A2) followed by a single-character lexeme or length-one string literal. Avail character literal notation is provided by the method ¢…!. The single-character form is sufficient for nearly every character, but the string literal form must be employed when the desired character is a quotation mark
" (U+0022), semicolon
; (U+003B), or nonprintable character.