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 for hairy ball
From The Free On-line Dictionary of Computing (30 December 2018) :

  hairy ball
      A result in topology stating that a continuous
     vector field on a sphere is always zero somewhere.  The name
     comes from the fact that you can't flatten all the hair on a
     hairy ball, like a tennis ball, there will always be a tuft
     somewhere (where the tangential projection of the hair is
     zero).  An immediate corollary to this theorem is that for any
     continuous map f of the sphere into itself there is a point
     x such that f(x)=x or f(x) is the antipode of x.  Another
     corollary is that at any moment somewhere on the Earth there
     is no wind.

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