The form of Latin S occurs from Greek Σ by dropping a person 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 presently while in the epigraphy of Western Greek alphabets, as https://keegancwrpf.uzblog.net/not-known-facts-about-bud-naked-45361677