Trilobular

Trilobular (formed from tri, Greek for three and lobus, Latin for tabs) describes a geometric shape that can be described as a "triangle-round". It is characterized by the fact that in spite of its triangular-like shape, its roll diameter is constant because a large and a small rounding face always oppose each other. It is therefore a curve of constant width. The measure of Trilobularity is given as a ratio between the inscribed and circumscribed shape.

Trilobular, with German captions

General References

Thomas Andreas Peter: Characterization of osteosynthesis plates (PDF) in German, dissertation at the ETH Zürich for Doctor of Technical Sciences, 2001, pp 139 et seq.
Reliable connection systems - Soluble, insoluble or both? (PDF; 758 kB) in German. Add: KGK Kautschuk Gummi Kunststoffe, 58th year, No. 9/2005.

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