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.
Font wall just refers to the wall in front of the listener / behind the speakers. It could be an interior wall or an exterior wall, but itâs worth noting that speaker boundary interference would be stronger if the wall is well isolated. A thick exterior wall would reflect more bass energy than a lightweight interior wall.