Megafuga- is a prefix used on a number n to indicate \(^nn\) using tetration (i.e. n pentated to 2). It was invented by Stephen Houben, who asked, when hearing about the fuga- prefix: Since the ^ operation is not associative, i.e. \(\left(x^yight)^z ot= x^{\left(y^zight)}\), this begs the question whether Fuga(3) means \(\left(3^3ight)^3 = 19683\) or \(3^{\left(3^3ight)} = 7625597484987\). Probably the latter, since the goal is to get big numbers.... Alistair Cockburn has kept fuga- as the former, and named the latter "megafuga-".