Understanding the Notation of \(\nabla \prod\)

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RyozKidz
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[tex]\nabla\prod[/tex]
can anyone can explain this notation to me?
 
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That's just two symbols which don't make any sense like that.
Can you explain in which context you found them and/or maybe provide a copy of the relevant part of the document (like a scan or copying the sentence)?
 
If it were [tex]\nabla\times[/tex], then it would be the "curl" operator.
 
It's the gradient of the PI vector. lol.