Ahavas Sholem Synagogue has windows that contain the shape that is in what form?
Ahavas Sholem Synagogue:  Some of its original windows are incised with the Star of David, which is repeated in a pediment at the roof level. Star of David:  Its shape is that of a hexagram, the compound of two equilateral triangles. Unlike the menorah, the Lion of Judah, the shofar and the lulav, the Star of David was never a uniquely Jewish symbol, although it had been used in that way as a printer's colophon since the sixteenth century.
hexagram