Mark % of underlying in thinkorswim?

Need your help. In thinkorswim`s option hacker you can find a filter with the name above.
What does that mean? The % change of the underlying?
Thanks.
 
It is precisely what the name states!
(MARK/Underlying)
Where "MARK" is of the specific option! You will likely require additional filters to "dial" in on your specific option requirements (time, delta, or whatever you are trying to do).
 
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