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What kind of package / font should I use to get the following version of the capital N in math mode?

enter image description here

This is the standard notation for the normal sheaf associated to the divisor D.

marked as duplicate by egreg, Red, Loop Space, Stefan Kottwitz Sep 24 '13 at 11:01

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$\mathcal{N}_D$ should give you what you're looking for. You don't need to load any special packages.

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