Developer for System z PL/I for Windows, Version 8.0, Programming Guide
Using a number:
You can specify the CCSID number (with or without any number
of leading zeroes), prefixed by any of the following (in any mixture
of upper or lower case):
IBM_
IBM-
CP
CP_
CP-
CCSID_
CCSID-
Developer for System z PL/I for Windows, Version 8.0, Programming Guide