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The l3fp package documentation refers to the >? operator (page 237 of interface3.pdf) but I could not find any example or explanation there despite it is recognized as shown in next example.
\documentclass{article}
\begin{document}
\ExplSyntaxOn
\fp_compare:nTF { 1 >? 2}
{⟨true code⟩} {⟨false code⟩}
\ExplSyntaxOff
\end{document}
That's documented under \fp_compare:nTF:
Any combination of the characters !<=>? can be used as a comparison operator (except that the first character can not be ?). If a ! is present the truth value is inverted. Otherwise the symbols <=>? stand for the cases which should be true. <=> are probably obvious, ? stands for "not ordered" (mostly relevant for NaN and tuples).
So >? is "bigger or not comparable". It can also be written as !<= ("not less than or equal").
\begin{joke}It checks whether a given number is maybe bigger than another given number.\end{joke}