Somewhat of a strange subject, but hear me out. I saw what looked to be a Catholic Priest, but I noticed a difference in his collar, as it had a black triangle on it. I found out (through conversation) that he was a Catholic Lay Brother and that the triangle on his collar represents the Trinity and signifies "The Brotherhood." Sound legit? I have been looking online and so far I've only seen that there may be some difference in the color or length of a Lay Brother's habit or that he may were a different color scapular. Is this type of collar part of Catholic tradition?