In TeXForm#
TeXForm parses this entry as a character leaf mapped to U+2A8C (GREATER-THAN ABOVE DOUBLE-LINE EQUAL ABOVE LESS-THAN).
In Relations103
All 103 in Relations\gtreqqlessSymbol
The ⪌ symbol (Greater-than above double-line equal above less-than, U+2A8C), written as \gtreqqless in LaTeX math mode.