[Tex/LaTex] How to make this symbol

symbols

Those symbols to represent the moment "torque" in vector mechanics . I'm sure I saw that symbol in some book but I do not remember .

enter image description here

Best Answer

Using \longrightarrow is too much, but \rightarrow is too short.

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

\makeatletter
\DeclareRobustCommand{\torquesymbol}{{%
  \vphantom{\circlearrowleft}%
  \mathpalette\torque@symbol\relax
}}
\newcommand{\mediumrightarrow}{\relbar\mathrel{\mkern-8mu}\rightarrow}
\newcommand\torque@symbol[2]{%
  \ooalign{%
    \hidewidth$\m@th#1\circlearrowleft$\hidewidth\cr
    $\m@th#1\mkern2mu\mediumrightarrow$\cr
  }%
}
\makeatother
\newcommand{\torque}[1]{\overset{\torquesymbol}{#1}}

\begin{document}

$\torque{M}$

\end{document}

enter image description here