A simple symbol does not contain any periods and does not start with a digit (0–9).

By default, its value is the characters of the symbol (that is, translated to uppercase). If the symbol has been assigned a value, it names a variable and its value is the value of that variable.

FRED
Whatagoodidea?    /* Same as WHATAGOODIDEA? */
?12

REXX symbol and hexadecimal code cross-reference shows the REXX symbols and their hexadecimal values as found in the U.S. Code Page (037).