In TeXForm#
TeXForm parses this entry as a character leaf mapped to U+2220 (ANGLE).
See also#
\backslashbase\lnotbase\negbase
The ∠ symbol (Angle, U+2220), written as \angle in LaTeX math mode.
TeXForm parses this entry as a character leaf mapped to U+2220 (ANGLE).
\backslash base\lnot base\neg base