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 like a variant with the 4-stroke letter Σ by now during the epigraphy of Western Greek alphabets, and also https://bud-naked-flower09752.blogdeazar.com/31438033/the-smart-trick-of-bud-naked-flower-that-no-one-is-discussing