Ulterro is equal to 100![#→#] in Extensible ! Notation. The term was coined by Yabuszko. It is ill-defined due to several issues on the definition of Extensible ! Notation. Sources ↑ Yabuszko, Extensible ! Notation Retrieved from "https://googology.wikia.org/wiki/Ulterro?oldid=311167" Categories Incomplete Numbers by Yabuszko Community content is available under CC-BY-SA unless otherwise noted.