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What is the name of this function, expressing the "similarity" of two sets $S_1$ and $S_2$?

$$ f(S_1,S_2) = {|S_1 \cap S_2| \over |S_1 \cup S_2|} $$

It's such a basic function that it surely have a name, but I can't find it.

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Jaccard index or Jaccard similarity coefficient.

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