Library /sys$common/syshlp/DTRHELP.HLB  —  Functions  FN$DELETE_SYMBOL, Example
       DTR> FN$DELETE_SYMBOL("MY_SYMBOL");
       DTR> FN$DCL("SHOW SYMBOL MY_SYMBOL") ;
       %DCL-W-UNDSYM, undefined symbol - check validity and spelling
       DTR>
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