ISSYMBOL Tests a variable to see if it contains a specified symbol from the MDL Rules list of symbols.  The result is 1 if it contains that symbol and 0 if it does not. 

SYNTAX:

ISSYMBOL(Cx, "Symbol")
where :
Cx is a conditional variable x
Symbol is the character or symbol to test for

NOTES:

ISSYMBOL will return BLANK when the value of the input Variable is BLANK

The Symbol to test for must be in the Symbol Setup table in System Setup -> System Tables.  This table is used to define MDL Rule Symbols, which is what ISSYMBOL was designed to test for

EXAMPLES:

V92 = ISSYMBOL(V71, "TEC")

Variable 92 will be 1 if and only if the value in Variable 71 contains the symbol "TEC", which in this case is a pre-defined MDL Rule symbol.