In TeXForm#
TeXForm parses this entry as a character leaf mapped to U+2A8B (LESS-THAN ABOVE DOUBLE-LINE EQUAL ABOVE GREATER-THAN).
In Relations103
All 103 in Relations\lesseqqgtrSymbol
The ⪋ symbol (Less-than above double-line equal above greater-than, U+2A8B), written as \lesseqqgtr in LaTeX math mode.