The form of Latin S occurs from Greek Σ by dropping just one out from the four strokes of that letter. The (angular) S-shape made up of a few strokes existed to be a variant of the 4-stroke letter Σ already within the epigraphy of Western Greek alphabets, along with https://marcokkdzv.ageeksblog.com/30497375/the-bud-naked-concentrate-diaries