Klein quartic -
In hyperbolic geometry, the Klein quartic, named after Felix Klein, is a compact Riemann surface of genus 3 with the highest possible order automorphism group for this genus, namely order 168 orientation-preserving automorphisms, and 168 × 2 = 336 automorphisms if orientation may be reversed.
https://en.wikipedia.org/wiki/Klein_quartic
Фу́тарк руны
Нортумбрийские руны