unit¶ property Surface.unit: str Symbol of the unit of measurement for surface. It must be a str. Available units are: 'm^2' for square meter, 'dm^2' for square decimeter, 'cm^2' for square centimeter, 'mm^2' for square millimeter. Returns¶ strSymbol of the unit of measurement for surface. Raises TypeErrorIf unit is not a str. KeyErrorIf the unit is not among available ones.