Use the amsmath package to create the below Extensible Arrows symbols
\usepackage{amsmath}

\xleftarrow{abc}

\xrightarrow{abc}
Use the mathtools package to create the below Extensible Arrows symbols
\usepackage{mathtools}

\xhookleftarrow{abc}

\xhookrightarrow{abc}

\xLeftarrow{abc}

\xleftharpoondown{abc}

\xleftharpoonup{abc}

\xleftrightarrow{abc}

\xLeftrightarrow{abc}

\xleftrightharpoons{abc}

\xmapsto{abc}

\xRightarrow{abc}

\xrightharpoondown{abc}

\xrightharpoonup{abc}

\xrightleftharpoons{abc}
Use the chemarrow package to create the below Extensible Arrows symbols
\usepackage{chemarrow}

\autoleftarrow{abc}{def}

\autorightarrow{abc}{def}

\autoleftrightharpoons{abc}{def}

\autorightleftharpoons{abc}{def}
Use the extpfeil package to create the below Extensible Arrows symbols
\usepackage{extpfeil}

\xlongequal{abc}

\xmapsto{abc}

\xtofrom{abc}

\xtwoheadleftarrow{abc}

\xtwoheadrightarrow{abc}
Use the DotArrow package to create the below Extensible Arrows symbols
\usepackage{DotArrow}

\dotarrow{abc}
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