👉 In geometry, an octachordal is a type of polygon that has eight sides and eight vertices. The term "octachordal" comes from the Greek word "octa" meaning "eight," and "chordal" means "line." This name is derived from its resemblance to a chord, which is a line segment with two endpoints. Each octachordal has 24 sides (8 in each octagon) and 16 vertices.