File:Key of Solomon Tetragrammaton.jpg

English: From one of the earliest manuscript of the grimoire known as Key of Solomon, entitled The Clavicle of Solomon, revealed by Ptolomy the Grecian, written in English and occasionally Latin, with orations in Latin. (Source)

The Tetragrammaton contained within the Key of Solomon shows the eight-pointed cross, which consist of two separate four-pointed crosses that are superimposed. The text "Jesus Salvator" (Jesus the Savior) connects the eight-pointed cross with the savior of the World. The Tetragrammaton marks the four letters that spell the name of God "IHVH" (Jehovah). The tilted square within a square is another way to express the eight-pointed cross. When the diagonals of the outer and inner square that touches the sides of the outer square are drawn, an eight-pointed cross emerges. (Source)