The tria-petaxis (formerly tria-petaksys, also called dekataxia-taxis) is equal to E1#1#1#3 = E1#1#(E1#1#10) in Hyper-E Notation. The term was coined by Sbiis Saibian. In up-arrow notation, this number is equal to \(10\uparrow\uparrow\uparrow\uparrow 3 = 10 \uparrow\uparrow\uparrow 10 \uparrow\uparrow\uparrow 10\). Username5243 calls this number toodcolplex, and it's equal to 10[3]10[3]10 in Username5243's Array Notation.