The terrible tethrateron is equal to E100(#^^####)^^#100 using Extended Cascading-E Notation. The term was coined by Sbiis Saibian. Sources ↑ Saibian, Sbiis. 4.3.7 Extended Cascading-E Numbers Part I. One to Infinity. Retrieved 2017-01-02. Retrieved from "https://googology.wikia.org/wiki/Terrible_tethrateron?oldid=171916" Categories: Numbers Numbers by Sbiis Saibian Extended Cascading-E numbers Binary phi level Community content is available under CC-BY-SA unless otherwise noted.