# Momentsymbol over a letter

I want to create a curved arrow over a letter as a symbol for the moment over the letter. Like in this picture:

I tried using \curvedarrowleft{C} but it didn't have that kind of functionality.

\curvedarrowleft is a typo, I believe; try \curvearrowleft instead.

\documentclass{article}
\usepackage{amssymb}  % for '\curvearrowleft' macro
\usepackage{amsmath}  % for '\overset' macro

\begin{document}
$\overset{\curvearrowleft}{C}$
\end{document}

• Yeah, it was the \overset{}{} command I needed, thanks! The typo was just in the question :) – user126131 Feb 23 '17 at 9:42

Comparing to Mico's excellent answer, the use of a stack allows for the gap between letter and moment arrow to be simply set with the use of an optional argument.

\documentclass{article}
\usepackage{amssymb}  % for '\curvearrowleft' macro
\usepackage{amsmath}  % for '\overset' macro
\usepackage{stackengine}
\stackMath
\renewcommand\useanchorwidth{T}
\begin{document}
$\overset{\curvearrowleft}{C}$
vs.\@
$\stackon{C}{\scriptstyle\curvearrowleft}~ \stackon[2pt]{C}{\scriptstyle\curvearrowleft}~ \stackon[1pt]{C}{\scriptstyle\curvearrowleft}$
\end{document}


• @user126131 You could also consider making the moment arrow slightly smaller, by using \scriptscriptstyle instead of \scriptstyle. – Steven B. Segletes Feb 24 '17 at 14:04

You can also load the packages stackrel and amssymb to your preamble, and then where you want the symbol you can use \stackrel{\curvearrowleft}{C}. Also note it is curvearrowleft, not curvedarrowleft. Here's an example

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

You symbol is $\stackrel{\curvearrowleft}{C}$
\end{document}

• \stackrel produces a math relation and should not be used for an ordinary symbol. Better use \overset from amsmath. – campa Feb 23 '17 at 9:27
• A downside of using \stackrel in this context is that the letter C will not be typeset on the baseline. – Mico Feb 23 '17 at 9:29