Indicator Variables
Indicator variables can be used with main variables intended for I/O, although certain indicator variables cannot be used for input (for example, in a WHERE clause).
PP2 uses indicator variables to show nullness of a field sent to or returned by the Teradata Database, as well as truncation of a character or byte string when placed into the corresponding main variable.
Indicator variables are documented in SQL Stored Procedures and Embedded SQL (B035‑1148).