In TeXForm#
TeXForm parses this entry as a character leaf mapped to U+2572 (BOX DRAWINGS LIGHT DIAGONAL UPPER LEFT TO LOWER RIGHT).
The ╲ symbol (Box drawings light diagonal upper left to lower right, U+2572), written as \diagdown in LaTeX math mode.
TeXForm parses this entry as a character leaf mapped to U+2572 (BOX DRAWINGS LIGHT DIAGONAL UPPER LEFT TO LOWER RIGHT).