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.
stub wall. Definition. A low wall, usually 4 to 8 (100 mm to 200 mm) high, placed monolithically with a concrete floor or other members to provide for control and attachment of wall forms.