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The Terratal, abbreviated Tt, is a measurement system formatted by the Earth Federal Republic in order to measure digital nations who do not claim physical territory. It has a conversion rate of 1 Terratal to 1 Metre, and has corresponding measurements such as the Kiloterratal, decaterratal, and the centaterratal.
In the EFR, territory is measured by the size of the citizens house, with the size being converted to square terratals in order to create a "digital area" of the nation.