\[LeftDoubleBracket]

  • Unicode: 301A.
  • Alias: Esc[[Esc.
  • Compound operator with built-in evaluation rules.
  • m is by default interpreted as Part[m, i, j, ...].
  • Sometimes used in mathematics to indicate a class of algebraic objects with certain variables or extensions.
  • Extensible character; grows by default to limited size.
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