# [Tex/LaTex] Stacked left and right arrows

articlesymbols

Of all the arrows available, I can't seem to find something that looks like this:

Is there a reason for this? The \leftrightharpoons is the closest alternative. But I would rather have the arrows look like in the image above.

Here's a code for it:

\documentclass{article}
\usepackage{amsmath}

\makeatletter
\newcommand{\lrarrow}{\mathrel{\mathpalette\lrarrow@\relax}}
\newcommand{\lrarrow@}[2]{%
\vcenter{\hbox{\ooalign{%
$\m@th#1\mkern6mu\rightarrow$\cr
\noalign{\vskip1pt}
$\m@th#1\leftarrow\mkern6mu$\cr
}}}%
}
\makeatother

\begin{document}

$A\lrarrow B_{\lrarrow}$

\end{document}