👉 Bipinnated is a concept in mathematics, specifically in algebraic topology and geometry. It refers to a set of points connected by a path that consists of two adjacent circles, meaning it has no edges between them. This idea was introduced by John Nash in 1958 as an extension of the concept of a circle. In this setup, each point on the boundary of a closed disk is connected to every other point on the interior of the same disk through a path that connects them