[Tex/LaTex] How to make another kappa

symbols

Good afternoon!
I would like you to tell me how to make another "kappa"? I mean, how to make the default kappa look like the \ae symbol? I need to use such variant in formula but I always get warnings when using "\ae" in equations. What should I do? I tried to use \varkappa but I don't like how it looks.
Thank you for your attention and also sorry for my Enlgish.

I've read you comments and made the following code: 

\newcommand{\Kappa}{\text{\ae}}

enter image description here

The problem is that inside \begin{align}\end{align} it looks like on the screen. Inside other environments such as [ ] or $ $ it looks like the normal kappa: ae. What should I do?

I tried to use "mbox" instead of "text" but the problem remains. Only here this letter looks wrong. Is it possible to avoid these misunderstandings?

Best Answer

You seem to be attaching meaning to a particular graphical representation of a symbol, but you shouldn't.

When hand writing, the variant kappa you seem to be discussing about often has two small loops, but typographical representations usually omit them. Those loops are probably responsible for you mistaking the symbol with the letter “æ” (used in Danish, Norwegian, Icelandic and Faroese and sometimes in English and French) that's a completely different thing.

You may not like the symbol \varkappa as provided by the amssymb package, but anyway you have to stick with some symbol you are able to reproduce and that's a realization of what Unicode calls GREEK KAPPA SYMBOL U+03F0.

Using æ for this is simply wrong.

You can get a “looping” realization within the Solomos font provided by the Greek Font Society and included in TeX Live (possibly also in MiKTeX).

\documentclass{article}
\usepackage{amsmath}
\usepackage{amssymb}

\DeclareFontFamily{U}{solomos}{}
\DeclareErrorFont{U}{solomos}{m}{n}{10}
\DeclareFontShape{U}{solomos}{m}{n}{
  <-> s*[1.1]  gsolomos8r
}{}

\newcommand{\vkappa}{\text{\usefont{U}{solomos}{m}{n}\symbol{'153}}}

\begin{document}

A kappa $\kappa$ and its variant $\vkappa$.

This is different from \ae{} and should not be confused with it.

The symbol $\varkappa$ is just a graphic variant, there's
no meaning implied in the graphical appearance.

\huge $\vkappa$

\end{document}

enter image description here

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