BlankSequence

(two characters) or BlankSequence[]
is a pattern object that can stand for any sequence of one or more Mathematica expressions.

or BlankSequence[h]
can stand for any sequence of one or more expressions, all of which have head h.

ExamplesExamplesopen allclose all

Basic Examples (3)Basic Examples (3)

A function definition that works with any nonzero number of arguments:

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A function definition that works with any nonzero number of real arguments:

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A function definition for a symbol followed by any nonzero number of integer arguments:

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