An Equiduoxal is 10(≡≡) = 10(10(≡))(10(≡)) using Dual Percoxy Notation.[1] This means that the number is equal to a power tower of Equinoxal 10's with Equinoxal at the top. The term was coined by Matthew Tainsh in 2016.



The name of this number is based on Equinoxal and "du", because the two subscripts are equal to an Equinoxal.

Approximations in other notations

Notation Approximation
Arrow notation \(10 \uparrow\uparrow (10 \uparrow\uparrow 11)\)


Community content is available under CC-BY-SA unless otherwise noted.