対たい数すう螺ら線せん

noun

logarithmic spiral; equiangular spiral

A mathematical curve whose tangent makes a constant angle with the radius vector. Used in geometry and natural forms.

• 対たい数すう螺ら線せんは、貝かい殻がらの形かたちなど自し然ぜん界かいにも見みられる。

  Logarithmic spirals can be seen in nature, such as in the shape of shells.