In the year that King Uzziah died I saw the Lord sitting upon a throne, high and lifted up; and the train of his robe filled the temple. Above him stood the seraphim. Each had six wings:with two he covered his face, and with two he covered his feet, and with two he flew. And one called to another and said:
“Holy, holy, holy is the Lord of hosts;
the whole earth is full of his glory!”
Isaiah 6:1–3, ESV
In the English translations of the Old Testament when we encounter the word “Lord” we are actually reading the Hebrew word Adhōnāy. On the other hand, when we read the word “LORD,” it is is completely different Hebrew word, Yehōwāh. Adhōnāy is actually a title for God meaning “sovereign one.” Yehōwāh is the sacred name of God. It was the name He used to reveal Himself to Moses at the burning bush. Yehōwāh is the unspeakable name, the holy name of God. The Hebrew scribes wrote it as YHWH. Therefore, it is referred to as the sacred tetragrammaton, the unspeakable four letters. Adhōnāy is the plural noun form of Ādhōn, which, when used in reference to God, means Lord. However, Adhōnāy is plural but singular in meaning. This speaks of the Holy Trinity, i.e. one God in three persons.