särmä

Etymology
From. Cognate with 🇨🇬 and 🇨🇬,. Probably originally "strip, band, ribbon", later "(sharp) edge". Modern geometry sense was given to it by.

Noun

 * 1) edge boundary line of a surface
 * 2)  edge 1D polytope, joining line between two vertices of a polygon
 * 3)  (undirected) edge