NotReverseElement[x, y, ...] displays as x \[NotReverseElement] y \[NotReverseElement] ....
NotRightTriangleEqual[x, y, ...] displays as x \[NotRightTriangleEqual] y \[NotRightTriangleEqual] ....
NotRightTriangle[x, y, ...] displays as x \[NotRightTriangle] y \[NotRightTriangle] ....
NotSquareSubsetEqual[x, y, ...] displays as x \[NotSquareSubsetEqual] y \[NotSquareSubsetEqual] ....
NotSquareSubset[x, y, ...] displays as x \[NotSquareSubset] y \[NotSquareSubset] ....
NotSquareSupersetEqual[x, y, ...] displays as x \[NotSquareSupersetEqual] y \[NotSquareSupersetEqual] ....
NotSquareSuperset[x, y, ...] displays as x \[NotSquareSuperset] y \[NotSquareSuperset] ....
NotSubsetEqual[x, y, ...] displays as x \[NotSubsetEqual] y \[NotSubsetEqual] ....
NotSubset[x, y, ...] displays as x \[NotSubset] y \[NotSubset] ....
NotSucceedsEqual[x, y, ...] displays as x \[NotSucceedsEqual] y \[NotSucceedsEqual] ....