In TeXForm#
TeXForm parses this entry as a character leaf mapped to U+27F5 (LONG LEFTWARDS ARROW).
\to\rightarrow\longrightarrow\mapsto\xrightarrow\Rightarrow\Leftrightarrow\leftarrow\longmapsto\hookrightarrow\Longrightarrow\longleftarrow
\longleftarrowSymbol
The ⟵ symbol (Long leftwards arrow, U+27F5), written as \longleftarrow in LaTeX math mode.