Dischiliahecatonhexaconta-myriaheptachiliadiacosioctaconta-zetton

The dischiliahectohexaconta–myriaheptachiliadiacosioctaconta–zetton, also known as fy, the E8 polytope, or the 421 polytope, is a semiregular polyzetton. It's made out of 17280 octaexa and 2160 hecatonicosoctaexa.