The pile was originally quite a simple shape, being a triangle reaching from the top of the shield down to a point near the lower centre A Glossary of Terms used in British Heraldry, J.H. Parker, Oxford, 1894, Entry:Pile. A clear example being that of CHANDOS awarded in 1337, Or a pile gules. There is some argument as to the origin, Wade suggests some similarity with the meaning of “pile” in construction (a foundation) and hence that the shape could be adopted by those who have demonstrated some ability in the building trade The Symbolisms of Heraldry, W. Cecil Wade, George Redway, London, 1898 P48. An earlier writer, Guillim, perhaps more plausibly suggested that the shape echoes those of a pennant or triangular flag A Display of Heraldry, J. Guillim, Blome, London, 1679, P52 The shape is quite distinctive however and became popular, leading to many embellishments to distinguish it from its close fellows, with multiple piles meeting at various points, starting from various edges and with additional decoration, leading to potentially quite complex descriptions!