Tethrateron

The tethrateron is equal to E100#^^####100 in Extended Cascading-E Notation, which expands to E100#^^###>#^^###>#^^###> ... ... >#^^###>#^^###>#^^###100 with 100 #^^###s. The term was coined by Sbiis Saibian

Etymology
The name of this number is based on the number tethrathoth and the root "teron" from "polyteron". Polyteron is the name for a 5-dimensional figure, so a "teron" can be considered a 4-dimensional figure.