You can define and use a symbol for any field or constant in the following ICETOOL operators: COUNT, DATASORT, DISPLAY, OCCUR, RANGE, SELECT, SPLICE, STATS, SUBSET, UNIQUE, and VERIFY. You can also use symbols in the DFSORT control statements you specify for an ICETOOL run. This makes it easy to create and reuse collections of symbols (that is, mappings) representing information associated with various record layouts. You can use system symbols (for example, &JOBNAME.) in your symbol constants. See Using symbols for fields and constants for complete details.