Xennillion

The xennillion is equal to \(10^{3 \cdot 10^{3 \cdot 10^{27}}+3}\), or \(10^{3 \cdot 10^{3 \cdot \text{octillion}} + 3}\). The term was coined by Jonathan Bowers.

Etymology
The name of this number is based on the suffix "-illion" and prefix "xenna-".