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What is the name of this letter $\mathcal{J}$ in the following deep learning equation? And what alphabet it is from?

$$\mathcal{J} = \frac{1}{m} \sum_{i=1}^m \mathcal{L}^{(i)}$$

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    $\begingroup$ I’m voting to close this question because it seems to me that it belongs to tex.stackexchange.com. $\endgroup$
    – hanugm
    Nov 5 '21 at 1:03
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It's an uppercase "J" from the math calligraphy alphabet, i.e. \mathcal{J} in latex.

$\mathcal{J}$

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