Notes on Prophecy of Ezechiel (Author Bishop Richard Challoner (ed.))

9:4 Mark Thau: Thau, or Tau, is the last letter in the Hebrew alphabet, and signifies a sign, or a mark; which is the reason why some translators render this place set a mark, or mark a mark without specifying what this mark was. But St. Jerome, and other interpreters, conclude it was the form of the letter Thau, which in the ancient Hebrew character, was the form of a cross.

Original from Project Gutenberg - Massive cleanup of OCR problems and editing done locally.