S NO FURTHER A MYSTERY

The shape 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 as being a variant with the 4-stroke letter Σ presently during the epigraphy of Western Greek alphabets, along with the a few and 4 strokes variants existed alongside one another while in the class