The form of Latin S arises from Greek Σ by dropping just one out of the 4 strokes of that letter. The (angular) S-condition made up of a few strokes existed to be a variant of the four-stroke letter Σ currently while in the epigraphy of Western Greek alphabets, as https://bud-naked-vape22086.blue-blogs.com/38271779/not-known-factual-statements-about-bud-naked