Tethracubor

The tethracubor (also called tethratertia) 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. Tethrasquare is comparable to Bowers' quadrunculus.

Etymology
The name of this number is based on the number tethrathoth and the word "cube".