A decker is equal to 10↑↑10 or 10 tetrated to 10, or a power tower of ten tens. It can be rendered 10^^10 and is equal to {10,10,2} in BEAF.
It is also called a dekalogue, and is equal to E1#10 in Hyper-E notation.
Username5243 gave the name doodcol to this number, and it's equal to 10[2]10 in UNAN.
Aarex gave the name digcol to this number, and it's equal so s(10,10,2).
This number has similarities to the Steinhaus 10-in-a-square (the innermost square of Megiston) and is less than the Ultrex function value 10 u 5 (where the base and first exponent are each 10 but each of the 4 further rising exponents is the value of the entire power tower beneath it).
Any Epstein system -illion or -illiard with 8 or more hyphens in the name,or octo' or a higher apostrophe prefix,is greater than this number.