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This function, Is Reference, tests whether a value, an expression or contents of a referenced cell is a reference to another cell.
ISREF(cellreference)
ISREF(value)
ISREF(expression)
[Required] Specify a cell reference, a numeric or text value, or an expression for the argument.
Use this function to test the contents of a cell, a numeric or text value directly, or a function or expression.
If the argument is a reference, this function returns TRUE. If the argument is not a reference, this function returns FALSE.
ISREF(B3) gives the result TRUE
ISREF(R1C2) gives the result TRUE
ISREF(12) gives the result FALSE