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I have encountered this symbol resembling a little flame (inside the norm inside the expectation) in a paper, does anyone know how to write it in latex? Here is the link to the paper: https://onlinelibrary.wiley.com/doi/abs/10.1002/jae.3950050202 its in page 105. Little flame

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    I think it is a script small s, but the picture is too small to be able to recognize it. Jul 13, 2022 at 13:43
  • Can you link to the paper where you found it? Jul 13, 2022 at 14:04
  • Edited the link in the question. Jul 13, 2022 at 14:12
  • The article is behind a paywall. Can you please insert an image with a better resolution? Don't worry about copyright, you're not breaking it.
    – egreg
    Jul 13, 2022 at 15:40
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    I checked the paper, and yes, I agree it is a small script s. It is defined as a generic element of a set denoted by capital script S. Jul 13, 2022 at 23:43

2 Answers 2

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To me, this small flame really just looks like a lowercase script S. I couldn't find a font that seemed to match exactly the picture, but the lowercase script S from Boondox seems rather similar.

\documentclass{article}
\usepackage{newtx}
\usepackage[scr=boondox]{mathalpha}
\begin{document}
\(E[\lVert \,_\mathscr{s} \rVert^2]\)
\end{document}
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If you can't find the exact symbol as part of an existing math font, I recommend following the lead of this answer, create latex symbol from vector graphics, in which you use a downloaded icon as for your flame symbol.

For example, this icon: http://www.clipartbest.com/cliparts/aiq/6oa/aiq6oaq5T.png can be downloaded to aiq6oaq5T.png and made part of a macro \mylogo, which will automatically adjust its size to the current fontsize. The flame is made the same height as an X of the current font.

\documentclass{article}
\usepackage{scalerel,amsmath}
\def\mylogo{\scalerel*{\includegraphics{aiq6oaq5T}}{X}}
\begin{document}
Can I insert my \mylogo{} inline?

{\tiny Can I insert my \mylogo{} inline?}

$E[\Vert \mylogo\Vert^2]$
\end{document}

enter image description here

If you want the logo universally smaller, change the X in the \mylogo definition to a smaller footprint, such as x:

enter image description here

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