S NO FURTHER A MYSTERY

The form of Latin S occurs from Greek Σ by dropping just one out in the 4 strokes of that letter. The (angular) S-condition composed of 3 strokes existed to be a variant on the 4-stroke letter Σ presently in the epigraphy of Western Greek alphabets, and also the 3 and four strokes variants existed along with each other in the classical Etruscan a