\[NotSquareSubset]
• Infix set relation operator.
• x y is by default interpreted as NotSquareSubset[x, y].
• See Section 3.10.4.
• See also: \[NotSquareSubsetEqual] , \[SquareSubset] .
Usage
\[NotSquareSubset] Notes
y is by default interpreted as NotSquareSubset[x, y]. 
