Frankly I am tired of dealing with the way you post questions.
It is a waste of time on your part as well as our part.
This current question is unreadable at best.
Why do you think that any of us ought to know what means? What is
Moreover, you have posted an image that actually cuts-off the given in the question. Do you fear being caught cheating by one of the net-search programs that check for copying?
Why not learn to post in symbols? You can use LaTeX tags
Here is an example.
[tex]\Omega S[tex] gives