The geegol is equal to \(\{10,100,4\}\) in BEAF, also written as 10{4}100 in the bracket-operator notation. In the up-arrow notation, this number is written as \(10 \uparrow\uparrow\uparrow\uparrow 100\). The term was coined by Jonathan Bowers. This number is also called hecta-petaxis (formerly hecta-petaksys) by Sbiis Saibian, and it's equal to E1#1#1#100 in Hyper-E notation.