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1.                 From The Free On-line Dictionary of Computing (19 January 2023):
                   
   
   
                   
                     
   wiggles
      In scientific computation, when solving partial differential
    equations by finite difference and similar methods, wiggles
      are sawtooth (up-down-up-down) oscillations at the shortest
      wavelength representable on the grid.  If an algorithm is
      unstable, this is often the most unstable waveform, so it
      grows to dominate the solution.  Alternatively, stable (though
      inaccurate) wiggles can be generated near a discontinuity by a
      Gibbs phenomenon.
      (2019-12-27)