<p>It's an uppercase &quot;J&quot; from the math calligraphy alphabet, i.e. <code>\mathcal{J}</code> in latex.</p>
<p><span class="math-container">$\mathcal{J}$</span></p>

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2021-11-03T15:33:24.543Z
2021-11-04T13:14:53.130Z
2021-11-04T13:14:53.130Z
Taw
<p>What is the name of this letter <span class="math-container">$\mathcal{J}$</span> in the following deep learning equation? And what alphabet it is from?</p>
<p><span class="math-container">$$\mathcal{J} = \frac{1}{m} \sum_{i=1}^m \mathcal{L}^{(i)}$$</span></p>

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2021-11-05T01:03:04.557Z
I’m voting to close this question because it seems to me that it belongs to https://tex.stackexchange.com/.
hanugm
<deep-learning><notation><loss>
What is the name of this letter $\mathcal{J}$?
Paul Reiners
# What is the name of this letter $\mathcal{J}$?

(Asked by: username_0 on 2021-11-03)

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

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

**Tags:** deep-learning, notation, loss

> **Comments:**
> **username_1**: I’m voting to close this question because it seems to me that it belongs to https://tex.stackexchange.com/.  

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## 1 answers

### Answer by username_2 on 2021-11-03. Score: 5 | Accepted answer

It's an uppercase "J" from the math calligraphy alphabet, i.e. `\mathcal{J}` in latex.

$\mathcal{J}$


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