Wikipedia
Zisurrû
Zisurrû, meaning “magic circle drawn with flour,” and inscribed ZÌ-SUR-RA-a, was an ancient Mesopotamian means of delineating, purifying and protecting from evil by the enclosing of a ritual space in a circle of flour. It involved ritual drawings with a variety of powdered cereals to counter different threats and is accompanied by the gloss: SAG.BA SAG.BA, Akkadian: māmīt māmīt, the curse from a broken oath, in the Exorcists Manual, where it refers to a specific ritual on two tablets the first of which is extant.