Grieder, Terence; Farmer, James D.; Hill, David V.; Stahl, Peter W.; Ubelaker, Douglas H. (2010-01-01). Art and Archaeology of Challuabamba, Ecuador. University of Texas Press. p.66. ISBN978-0-292-77912-9. The S-design is known first on Challuabamba pottery of the fourth millennium BC, where it may have had symbolism connected with female fertility (Doyon 1977:110), but it survives in modern Peru under the Quechua name pawsa, a fertility symbol often represented on women's shawls in what is called the shawl of the Earth Mother, her pawsa lliklla.
