8

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

  • 2
    Notwithstanding the usefulness of learning how to make a new symbol, are you sure you want to use it? A descriptive symbol should be used to describe things that are semantically related. Even if you are not mistaken that you have truly seen this, torque is a force like any other, so you'll probably want to represent it as a regular vector, like \vec{\tau}, unless you have a clear reason to make a distinction. – giusti Dec 30 '16 at 20:15
  • @giusti The torque is a pseudovector, as it does not really behave like a vector. Moreover, it is only really a vector in three dimensions; in two dimensions it is a scalar and in higher dimensions a two-form. The distinction is justified, though not always needed. – Joonas Ilmavirta Dec 31 '16 at 12:02
  • Interesting, point taken! I have never seen such a distinction, though, so I'm genuinely curious. Can you show me a text where this symbol is used so I can understand the context? – giusti Dec 31 '16 at 17:10
8

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

7

Try this:

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

% for convenience, you may define a new command:
\newcommand{\torque}[1]{\overset{\hspace{.5em}\circlearrowleft\hspace{-.9em}\longrightarrow}{#1}}

\begin{document}
    $\overset{\hspace{.5em}\circlearrowleft\hspace{-.9em}\longrightarrow}{M}$
    or with the command:
    $\torque{M}$
\end{document}

EDIT: of course you may define a specific new command (even if egreg says that \longrightarrow is too long, and he is always right!).

enter image description here

2

One way to make the torque symbol is to use \longrightarrow and the \leftturn symbol from wasysymb.

Code:

\documentclass{standalone}
\usepackage{wasysym}
\usepackage{scalerel}
\usepackage{stackengine}
\usepackage{graphicx} % for \scalebox macro
\newcommand\torque{%
  \ooalign{
  \hss\scalebox{1}{$\leftturn$}\hss\cr%
  \hbox{\scalebox{1}{$\longrightarrow$}}}}
\begin{document}
Torque symbol
$\torque$\\
\end{document}

Yields:

enter image description here

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