Definitions for "Polyline"
a line created by a series of shorter straight line segments
A type of ST_Curve made up of 2-n points. Can be straight or 'curvy'.
A term for a line used by some GIS packages.
A “smart” shape placed in a AutoCad floor plan that is capable of determining with extreme precision the area of the space it encompasses, and also documenting that area. This is an AutoCad term. Other CAD systems use other terms, like "shape" in Bently Microstation.