וצפית אתו זהב טהור מבית ומחוץ תצפנו ועשית עליו זר זהב סביב
Rashi explains that the zer, diadem, was a sort of crown, going all the way around to the top of the Aron, above its edge… This zer, crown, is a symbol for the Kesser Torah, Crown of the Torah. In Pirkei Avos 4:13, Rabbi Shimon says: “There are three crowns: the crown of Torah; the crown of Kehunah, the Priesthood; the crown of Malchus, Kingship; and the crown of a shem tov, a good name, goes above them.” The question is obvious. The Mishnah states that there are three crowns, and then mentions a fourth crown, the crown of a good…