wall an architectural partition with a height and length greater than its thickness; used to divide or enclose an area or to support another structure; "the south wall had a small window"; "the walls were covered with pictures"
bell gable an extension of a gable that serves as a bell cote
corbie gable (architecture) a gable having corbie-steps or corbel steps
A gable is the generally triangular portion of a wall between the edges of a sloping roof. The shape of the gable and how it is detailed depends on the structural system being used (which is often related to climate and availability of materials) and aesthetic concerns. Thus the type of roof enclosing the volume dictates the shape of the gable.
OmegaWiki Dictionary
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gable The triangular area of external wall adjacent to two meeting sloped roofs.
