In TeXForm#
TeXForm parses this entry as a character leaf mapped to U+2286 (SUBSET OF OR EQUAL TO).
In Relations103
All 103 in RelationsThe ⊆ symbol (Subset of or equal to, U+2286), written as \subseteq in LaTeX math mode.
TeXForm parses this entry as a character leaf mapped to U+2286 (SUBSET OF OR EQUAL TO).