Lemniscate

{ } n. [ L. lemniscatus adorned with ribbons, fr. lemniscus a ribbon hanging down, Gr. lhmni`skos. ] (Geom.) A curve in the form of the figure 8, with both parts symmetrical, generated by the point in which a tangent to an equilateral hyperbola meets the perpendicular on it drawn from the center. [ 1913 Webster ]