MultiWave fill areas use a wave pattern defined by a line, or lines, drawn on the fill area by the designer. Vary the density, or use a motif for the stitch lines.
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    MultiWave Fill, using a density of 20 and a Triple Stitch border (Revue UC 25-120mm MW, Display category)  | 
For an example using MultiWave Fill, see Create a Two Letter Monogram.