The plate of pure gold was like a half coronet, reaching, as the Jews say, from ear to ear. Holiness to the Lord, to mind the priest of his special consecration to God, and of that singular holiness which was required of him, as at all times, so especially in his approaches to God. It might also represent Christ, who is called the Holy One of God, and who is a crowned Priest, or both King and Priest.
Related Commentaries of Exodus 28:36
Exodus 28:36
36 And thou shalt make a plate of pure gold, and grave upon it, like the engravings of a signet, HOLINESS TO THE LORD.