What's the meaning of the rho?
The guiding shape that defines >>14 >>85 the rings is a rhombus.
https://en.wikipedia.org/wiki/Rhombus#Etymology
The word "rhombus" comes from Ancient Greek: ῥόμβος, romanized: rhombos, meaning something that spins,[4] which derives from the verb ῥέμβω, romanized: rhémbō, meaning "to turn round and round."[5] The word was used both by Euclid and Archimedes, who used the term "solid rhombus" for a bicone, two right circular cones sharing a common base.[6] The surface we refer to as rhombus today is a cross section of the bicone on a plane through the apexes of the two cones.