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  • Infix ordering operator.
  • x

    y is by default interpreted as LeftTriangle[x,y].
  • Used in pure mathematics to mean "normal subgroup of".
  • See The Mathematica Book: Section 3.10.4.
  • See also: \[LeftTriangleEqual], \[LeftTriangleBar], \[LeftArrow], \[NotLeftTriangle], \[RightTriangle], \[EmptyUpTriangle], \[FilledUpTriangle].