VMS Help PASCAL, Lexical Elements, Special Symbols  *Conan The Librarian (sorry for the slow response - running on an old VAX)

  Special  symbols  represent  delimiters,  operators,  and  other
  syntactic  elements.  Some symbols are composed of more that one
  character; you cannot place a space between  the  characters  of
  these  special symbols.  Examples of special symbols include the
  apostrophe ('), the assignment operator (:=) and the  not  equal
  sign (<>).