The fzgoogol is equal to googolgoogol = (10100)10100 = 10100*10100 = 1010102. The name is formed by applying the fz- prefix to a googol. Written as 1010102 it looks only slightly larger than a googolplex, though in reality you need to raise a googolplex to the 100th power to get a fzgoogol. It is 1 followed by exactly 100 times as many zeros as a googolplex has.
A fzgoogol is also an upper-bound to the googolbang.