DocumentationMathematicaThe Mathematica BookMathematica Reference GuideListing of Named Characters
SquareSubset
\[SquareSubset]
Infix set relation operator. x y is by default interpreted as SquareSubset[x, y]. Used in computer science to indicate that x is a substring occurring at the beginning of y. See Section 3.10.4. See also: \[NotSquareSubset] , \[SquareSuperset] .
\[SquareSubset]
Infix set relation operator. 
y is by default interpreted as SquareSubset[x, y]. 
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