geomeetriaelement, mis füüsiliselt töödeldava osise tegelikul pinnal ei eksisteeri ja mis ei ole loomult terviklik element, geometrical feature, which does not exist physically on the real surface of the workpiece and which is not natively a nominal integral feature, geometrical feature, which is a median, displaced, congruent or rerlected feature resulting from a set of operations on an integral or filtered feature