figureeightshaped

Figureeightshaped is a term used to describe objects, contours, or structures that resemble two rounded lobes connected at a narrow region, producing a silhouette similar to the numeral eight or the infinity symbol. The term is descriptive rather than technical and is applied across disciplines to convey a shared geometric intuition rather than a single formal definition.

In mathematics, figure-eight shapes appear as specific plane curves called lemniscates. The most famous variant is the Bernoulli lemniscate, which forms a smooth, symmetric hourglass-like outline. The sideways eight, the infinity symbol, is a related form that is widely used in notation and design. In topology and knot theory, the figure-eight knot is a well-studied nontrivial knot whose projection visually resembles the number eight.

In physics and celestial mechanics, figure-eight configurations can arise as idealized trajectories or field patterns. A notable example is the figure-eight orbit in the three-body problem, where three equal masses trace a persistent eight-shaped path under Newtonian gravity.

Common applications of figure-eight shapes include decorative design, branding, and logos, where the shape conveys balance and continuity. In biology and chemistry, certain molecular or structural motifs may exhibit a figure-eight cross-section or orientation, though such appearances are context dependent.

See also:

- Infinity symbol

- Lemniscate

- Figure-eight knot

- Figure-eight orbit