Versillion

The versillion is equal to $$10^{3 \cdot 10^{3 \cdot 10^{3 \cdot \text{duodecillion}}} + 3}$$, or $$10^{3 \cdot 10^{3 \cdot 10^{3 \cdot 10^{39}}} + 3}$$. The term was coined by Jonathan Bowers.

Etymology
The name of this number is based on the word "Univers e" and the suffix "-illion".