NestedLessLess[x, y, ...] displays as x \[NestedLessLess] y \[NestedLessLess] ....
NotCongruent[x, y, ...] displays as x \[NotCongruent] y \[NotCongruent] ....
NotCupCap[x, y, ...] displays as x \[NotCupCap] y \[NotCupCap] ....
NotDoubleVerticalBar[x, y, ...] displays as x \[NotDoubleVerticalBar] y \[NotDoubleVerticalBar] ....
NotebookBrowseDirectory is a global option that determines the current working directory.
NotebookDynamicExpression is an option for notebooks that specifies an expression to be dynamically updated whenever that notebook is open.
NotEqualTilde[x, y, ...] displays as x \[NotEqualTilde] y \[NotEqualTilde] ....
NotExists[x, y] displays as \[NotExists] _x y.
NotGreaterEqual[x, y, ...] displays as x \[NotGreaterEqual] y \[NotGreaterEqual] ....
NotGreaterFullEqual[x, y, ...] displays as x \[NotGreaterFullEqual] y \[NotGreaterFullEqual] ....