Jovillion

The jovillion is equal to $$10^{3 \cdot 10^{3 \cdot 10^{3\text{ sextillion}}} + 3}$$, or $$10^{3 \cdot 10^{3 \cdot 10^{3 \cdot 10^{21}}} + 3}$$. The term was coined by Jonathan Bowers.

Tamara calls this number neptillion, a name inspired by the word "Neptune".

Etymology
The name of this number is based on the word "J ehov an" and the suffix "-illion".