IBM SC34-5764-01 - Manual (Page 184)

SAY
Purpose
SAY
expression
;
SAY writes a line to the default output stream (the terminal) so the user sees it displayed. The result of
expression may be of any length. If you omit expression, the null string is written.
You can use the SET TERMOUT command to redirect SAY output.
Example:
data=100
Say data 'divided by 4 =>' data/4
/* Displays: "100 divided by 4 => 25"
*/
SAY
162 CICS TS for VSE/ESA: REXX Guide