S NO FURTHER A MYSTERY

The form of Latin S arises from Greek Σ by dropping a person out on the 4 strokes of that letter. The (angular) S-shape composed of 3 strokes existed to be a variant in the 4-stroke letter Σ already while in the epigraphy of Western Greek alphabets, as well as the 3 and 4 strokes variants existed together with each other within the classical Etru