NotLess
(Built-in Mathematica Symbol) NotLess[x, y, ...] displays as x \[NotLess] y \[NotLess] ....
NotLessSlantEqual[x, y, ...] displays as x \[NotLessSlantEqual] y \[NotLessSlantEqual] ....
NotLessTilde[x, y, ...] displays as x \[NotLessTilde] y \[NotLessTilde] ....
Not
(Built-in Mathematica Symbol) ! expr is the logical NOT function. It gives False if expr is True, and True if it is False.
NotNestedGreaterGreater[x, y, ...] displays as x \[NotNestedGreaterGreater] y \[NotNestedGreaterGreater] ....
NotNestedLessLess[x, y, ...] displays as x \[NotNestedLessLess] y \[NotNestedLessLess] ....
NotPrecedesEqual[x, y, ...] displays as x \[NotPrecedesEqual] y \[NotPrecedesEqual] ....
NotPrecedes[x, y, ...] displays as x \[NotPrecedes] y \[NotPrecedes] ....
NotPrecedesSlantEqual[x, y, ...] displays as x \[NotPrecedesSlantEqual] y \[NotPrecedesSlantEqual] ....
NotPrecedesTilde[x, y, ...] displays as x \[NotPrecedesTilde] y \[NotPrecedesTilde] ....