1 In the year of King Uzziah’s death I saw the Lord sitting on a throne, lofty and exalted, with the train of His robe filling the temple. 2 Seraphim stood above Him, each having six wings: with two he covered his face, and with two he covered his feet, and with two he flew. 3 And one called out to another and said, “Holy, Holy, Holy, is the LORD of hosts, The whole earth is full of His glory.” Isaiah 6:1-3 (NASB)
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.