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  • lhs === rhs yields True if the expression lhs is identical to rhs, and yields False otherwise.
  • SameQ requires exact correspondence between expressions, except that it considers Real numbers equal if their difference is less than the uncertainty of either of them.
  • 2 === 2. gives False.
  • === === gives True if all the are identical.
  • See the Mathematica book: Section 2.3.5.
  • See also: UnsameQ, Equal, Order.