conchoid

conchoid
[ˈkɒŋkɔɪd]
noun

(Mathematics)a plane quartic curve consisting of two separate branches either side of and asymptotic to a central straight line (the asymptote), such that if a line is drawn from a fixed point (the pole) to intersect both branches, the part of the line falling between the two branches is of constant length and is exactly bisected by the asymptote
(数)蚌线
Such curves are represented by the general equation (x - a)²(x² + y²) = b²x², where a is the distance between the pole and the asymptote, and b is the constant length. The branch on the same side of the asymptote as the pole typically has a cusp or loop
蚌线由等式(x - a)²(x² + y²) = b²x²表示，其中a是坐标极点与渐近线间的距离，b是恒长。渐近线这边的曲线支有一尖点或圈

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