User blog comment:SandstoneGem/i created a my own number A REALLY REALLY BIG ONE/@comment-30754445-20170606135244

This number is equal exactly 2F(E60+1) in my letter notation. And a simple FE60 is a very good approxmation.

So it's between Bower's tritri (about FE13) and Saibian's Googoldex (about FE100).

Or if you prefer a single letter with a fractional argument:

Tritri ~ G2.311

Googoluberplex ~ G2.352

Googoldex ~ G2.362