trecentillion 

One with 903 zeroes after it. Higher than a ducentillion which is one with 603 zeroes after it.

It's a trecentillion times better.

trecentillion by DNHG April 18, 2006

Trescentillion 

Trescentillion is 10^312 or 1 followed by 312 zeros (sure is a lot). It is not to be confused with Trecentillion which is 10 to the 903, much more than 312.

What is after a duocentillion?
Oh, It's a trescentillion.

Trescentillion by Ypro2356 April 14, 2021