In Duncan’s (York Rite) Ritual and Monitor this symbol is mentioned in connection to the third “craft” degree.
The Book Of Constitutions, Guarded By The Tiler’s Sword,
Reminds us that we should be ever watchful and guarded in our thoughts, words, and actions, particularly when before the enemies of Masonry – ever bearing in remembrance those truly Masonic virtues, silence and circumspection.
Ahiman Rezon. Rituals of Freemasonry by Daniel Sickels (1870)
Duncan’s Masonic Ritual and Monitor (1866) by Malcolm C. Duncan