What is the name for a scripted letter in a paper?

[Afonso Campos]

I was wondering if someone could help me figure out what a scripted letter in a paper I'm reading is called.

The scripted letter is in equation (3). It looks like some kind of a scripted T.

 

[Fightfish]

It looks like a J in Fraktur script to me (i.e. the mathfrak command in LaTeX).

You can find a reference list of characters in the various scripts here:
https://tex.stackexchange.com/questions/58098/what-are-all-the-font-styles-i-can-use-in-math-mode

 

[DrClaude]

It looks like a J in Fraktur script to me (i.e. the mathfrak command in LaTeX).

It is actually an I, representing the imaginary part, obtained using \Im:
$$
\Im \omega_0 \leq \pi T_\mathrm{BH}\, .
$$

 

[DrClaude]

Arrrgg! MathJax doesn't render that with the right font. Here is how it will look in $\LaTeX$:

 

[fresh_42]

The scripted letter is in equation (3). It looks like some kind of a scripted T.

You can test it in the editor section: type something included in $\textrm{$ \mathfrak{something} $}$ and see what it looks like - $\mathfrak{something}$ - by the editor function "preview".

Frequently used fonts are:
\mathbb{} for double lines as in $\mathbb{R}$
\mathcal{} for a look similar to hand writing $\mathcal{G}$
\mathfrak{} fraktura for "old" letters like in $\mathfrak{su}(2)$

Here's an overview of LaTeX symbols: http://detexify.kirelabs.org/symbols.html

 

[Afonso Campos]

It is actually an I, representing the imaginary part, obtained using \Im:
$$
\Im \omega_0 \leq \pi T_\mathrm{BH}\, .
$$

Makes sense! Thanks!