Yetitrolillion is equal to 103*103*102.4*1028+9*1024+3. The term was coined by Trakaplex trying to make puns on Bowers' illions on answers.com.  This was the first confirmed quantity, though the name itself was first mentioned on a jocular Googology Testing wiki post trying to use illions in sentences.
Approximations in other notations
- what is the biggest known number answers.com 1/14/2021.
- Onliyetapunillion? Gota-tenda-horsi-onli-yeta-palillion? Googology Testing Wiki. Nov 25, 2020.