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BlankSequence (__)

__ (two _ characters) or BlankSequence[]
is a pattern object that can stand for any sequence of one or more Mathematica expressions.
__h or BlankSequence[h]
can stand for any sequence of one or more expressions, all of which have head h.
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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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In[2]:=
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A function definition for a symbol followed by any nonzero number of integer arguments:
In[1]:=
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In[2]:=
Click for copyable input
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