In TeXForm#
TeXForm parses this entry as a character leaf mapped to U+2194 (LEFT RIGHT ARROW).
\to\rightarrow\longrightarrow\mapsto\xrightarrow\Rightarrow\Leftrightarrow\leftarrow\longmapsto\hookrightarrow\Longrightarrow\leftrightarrow
\leftrightarrowSymbol
The ↔ symbol (Left right arrow, U+2194), written as \leftrightarrow in LaTeX math mode.