A silver pendant with the "SHEMA YISRAEL" prayer (Hebrew: שמע ישראל).
These first two words of a section of the Torah are also the title of a prayer central to Jewish morning and evening services: "Hear, O Israel: The Lord is our God, the Lord is one" (Deuteronomy 6:4).
More about the prayer, its Hebrew text and its meaning: Shema Yisrael – Text, Translation, and Meaning