It's a map size, that can be used on map script, like continents, pangea, fractal, ... (except inland sea that seems to be broken)
The TSL are for the Earth/Europe maps which are of fixed size (two Earth maps, one giant and the other large, and one Europe map, which is enormous)
The TSL are for the Earth/Europe maps which are of fixed size (two Earth maps, one giant and the other large, and one Europe map, which is enormous)