**Fz-** is a prefix used on a number *n* to indicate \(n^n\) or equivalently \({^2}n\) (i.e n tetrated to 2). It was invented by Allstair Cockburn to continue the gar- prefix invented by his son.^{[1]} Fz(n) is equivalent to \(n[3]\) (triangle(n)), using Steinhaus-Moser notation.

The first few values of fz-n are 1, 4, 27, 256, 3125, 46,656, 823,543, 16,777,216, 387,420,429, and 10,000,000,000.

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