# How to use Cyrillic letter as a mathematical symbol? [duplicate]

I want to use \cyrgup in my document for some derivations. Is there any package that needs to be installed?

Some other fonts. As can be seen here, the command \cyrgup is a mapping to the unicode U+0491 CYRILLIC SMALL LETTER GHE WITH UPTURN. Here are the available fonts and you may check possible symbols on your machine.

% arara: pdflatex

\documentclass{article}
\usepackage[T2A]{fontenc}
\usepackage{gentium}

\begin{document}
\cyrgup
\end{document}


% arara: lualatex

\documentclass{article}
\usepackage{fontspec}
\newcommand*{\cyrgup}{\symbol{"0491}}

\begin{document}
\setmainfont{code2000.ttf}
\cyrgup
\setmainfont{symbola.ttf}
\cyrgup
\setmainfont{quivira.otf}
\cyrgup
\setmainfont{EB Garamond}
\cyrgup
\setmainfont{Linux Libertine O}
\cyrgup
\end{document}


The \cyrgup command is defined in the T2A font encoding (cyrillic and not greek...), so it should suffice to load the package fontenc with that encoding table.

MWE:

\documentclass{article}
\usepackage[utf8]{inputenc}
\usepackage[T1,T2A]{fontenc}

\begin{document}
\cyrgup
\end{document}


Output