Character-Strings

You can use character-strings containing single-byte characters to form:
IBM Extension
You can use character-strings containing user-defined DBCS words to form:

DBCS character-strings are constructed using characters from the Double-Byte Character Set. DBCS character-strings can be embedded into nonnumeric strings, including mixed literals. Embedded DBCS character-strings must be delimited by an opening "shift-out" control character and a closing "shift-in" control character. DBCS literals may include characters that range from X'00' to X'FE' for both bytes. DBCS literals cannot include X'0F7F' (or X'0F7D' if the APOST option is selected).

End of IBM Extension