Likutei Moharan, Part II 83:2/ליקוטי מוהר"ן·תנינא פ״ג:ב׳

12 . As a result, one becomes a free man—i.e., he acquires the sanctity of Shabbat, when work is forbidden. For ShaBaT is Shin BaT. Shin symbolizes three colors: fire, wind, water. Bat is prayer, the blessings, the concept of: He had a bat (daughter), and Bakol was her name (Bava Batra 16b), as in “and God had blessed Avraham bakol (with everything)” (Genesis 24:1).