The shape of Latin S arises from Greek Σ by dropping just one out of your 4 strokes of that letter. The (angular) S-condition made up of a few strokes existed to be a variant of the 4-stroke letter Σ by now during the epigraphy of Western Greek alphabets, as https://bud-naked-pre-rolls19752.ezblogz.com/63009521/the-smart-trick-of-bud-naked-flower-that-no-one-is-discussing