In TeXForm#
TeXForm parses this entry as a character leaf mapped to U+228A (SUBSET OF WITH NOT EQUAL TO).
\subsetneqSymbol
The ⊊ symbol (Subset of with not equal to, U+228A), written as \subsetneq in LaTeX math mode.
The ⊊ symbol (Subset of with not equal to, U+228A), written as \subsetneq in LaTeX math mode.
TeXForm parses this entry as a character leaf mapped to U+228A (SUBSET OF WITH NOT EQUAL TO).