User blog comment:SteviWunda/How big is this number?/@comment-31815849-20170425082648/@comment-28606698-20170425103652

@SteviWunda: Yesterday I inattentively read your post and in my mind I have seen your number as follows:

$$\left. \begin{matrix} &&a \underbrace{\uparrow\uparrow\uparrow\uparrow\cdots\uparrow\uparrow\uparrow\uparrow}a\\ && \vdots &&\\ & &a \underbrace{\uparrow\uparrow\cdots\uparrow\uparrow}a \\ & &a \end{matrix} \right \} \text {a+1 layers}=$$

where $$a=10^{10^{10^{100}}}=E100 \# 3$$

and that is equal to {a,a+1,1,2} using BEAF,

PsiCubed correctly noticed  about the "Twist". But nevertheless approximations you can see below are good enough.

As I said, your number is near lower bound of so called Chained arrow notation level according to classification adopted in this wikia.