Kartézská soustava souřadnic
"Cartesian Coordinates" specify each point uniquely in a plane by a pair of numerical coordinates, which are the signed distances from the point to two fixed perpendicular directed lines, measured in the same unit of length.
Applicable units are those of quantitykind:Length
http://en.wikipedia.org/wiki/Cartesian_coordinate_system
"Cartesian Coordinates" specify each point uniquely in a plane by a pair of numerical coordinates, which are the signed distances from the point to two fixed perpendicular directed lines, measured in the same unit of length.
http://www.iso.org/iso/catalogue_detail?csnumber=43012