The Grand Petaextremexul is equal to ((...((200![1(1)[2200,200,200,200]])![1(1)[2200,200,200,200]])...)![1(1)[2200,200,200,200]])![1(1)[2200,200,200,200]] (with Petaextremexul parentheses), using Hyperfactorial array notation. The term was coined by Lawrence Hollom.