R. David Kasher on Parashat Tetzaveh: Following the Thread

One of the most dazzling of all the ornate garments worn by the Kohen Gadol, the High Priest, was the tzitz (ציץ), a tiara that that encircled the turban on his head, forming a sort of crown.  In the front, resting on his forehead, was a plate of gold sealed with a boldly proclaimed message: “Holy to the Eternal!”  But the intricate design of the tzitz was encoded with other, hidden messages that complicated its meaning.