A Jewish religious holiday celebrated on the 33rd day of the Counting of the Omar, which occurs on the 18th of the Hebrew month of lyar. According to kabbalistic tradition, this day marks the hillula (celebration, interpreted by some as anniversary of the death) of Rabbi Shimon bar Yochai, “the Rashbi”, a Mishnaic sage and leading disciple of Rabbi Akiva in the 2nd century, and the ay on which he revealed the deepest secrets of kabbalah in the form of the Zohar (Book of Splendor, literally ‘radiance’), a landmark text of Jewish mysticism.