The greagol (short for 'great googol') is equal to E100#100#100, using Hyper-E Notation. The term was coined by Sbiis Saibian. The greagol can be described as the 100th member of the "grangol series", where the 1st member is a grangol (E100#100), the 2nd is the grangoldex (E100#grangol), the 3rd is the grangoldudex (E100#grangoldex), ... and in general the nth member of the series, call it S(n), is equal to E100#S(n-1). It follows that: Greagol = E100#(E100#(E100#( ... ... (E100#(E100#100)) ... ... ))) w/100 "E"s in the expression. A greagol can also be defined as follows: