A tuple is a fixed fixed-length list containing elements that need not have the same type. It can be, and often is, used as a key-value pair. A row (sometimes called a record) is the set of fields within a table that are relevant to a specific entity.
The stem wall on a concrete foundation is essentially the supporting wall that joins the foundation of a building to the vertical walls of the structure that is constructed atop the foundation.
Definition of wall for Students. 1 : one of the sides of a room or building. 2 : a solid structure (as of stone) built to enclose or shut off a space The property is surrounded by a brick wall. 3 : something that separates one thing from another a wall of mountains.