/sys$common/syshlp/helplib.hlb FORTRAN, Character Sets, FORTRAN 77 Standard  *Conan The Librarian (sorry for the slow response - running on an old VAX)

  The character set specified by the FORTRAN-77 Standard consists of
  the uppercase letters A through Z, the digits 0 through 9, and the
  following special characters:

     SP   (space)                 ,    (comma)
     $    (dollar sign)           -    (minus sign)
     '    (apostrophe)            .    (period)
     (    (left parenthesis)      /    (slash)
     )    (right parenthesis)     :    (colon)
     *    (asterisk)              =    (equal sign)
     +    (plus sign)