The form of Latin S occurs from Greek Σ by dropping one out from the four strokes of that letter. The (angular) S-shape composed of 3 strokes existed for a variant of your 4-stroke letter Σ now within the epigraphy of Western Greek alphabets, plus the 3 and four strokes https://budnaked43086.tkzblog.com/31178222/5-simple-techniques-for-bud-naked-vape