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In general, any smooth curve joining two points. In particular, any portion (other than the entire curve) of a Circle or Ellipse.
See also Apple, Circle-Circle Intersection, Five Disks Problem, Flower of Life, Lemon, Lens, Piecewise Circular Curve, Reuleaux Polygon, Reuleaux Triangle, Salinon, Seed of Life, Triangle Arcs, Venn Diagram, Yin-Yang