In TeXForm#
TeXForm parses this entry as a character leaf mapped to U+27EF (MATHEMATICAL RIGHT FLATTENED PARENTHESIS).
The ⟯ symbol (Mathematical right flattened parenthesis, U+27EF), written as \rgroup in LaTeX math mode.
TeXForm parses this entry as a character leaf mapped to U+27EF (MATHEMATICAL RIGHT FLATTENED PARENTHESIS).