👉 In mathematics, an "earstone" is a type of mathematical object that represents an infinite set of points in the plane or space. It is a set of points where each point has a unique distance from other points in the set. The term "earstone" was first introduced by Carl Friedrich Gauss and is often used to describe sets like the integers, which are infinite because they do not have any gaps between them. However, earstones can be defined for more general mathematical objects as well,