The official organization of the Chabad-Lubavitch movement of Judaism, which is based in Crown Heights, N.Y. Chabad-Lubavitch is a branch of Hasidism, a movement within Orthodox Judaism founded by 18th-century mystics. Chabad emphasizes reaching out to nonpracticing Jews. The term Chabad comes from an acronym of the Hebrew words for wisdom, understanding and knowledge.
REFERENCE: Religion Stylebook