Who is tetragrammaton?

The Tetragrammaton is a term used to refer to the four Hebrew letters YHWH (יהוה), which represent the name of God in the Hebrew Bible. It is considered sacred in Judaism and is often not pronounced aloud, with substitutes like "Adonai" or "HaShem" being used instead. In Christian contexts, it is sometimes rendered as "Jehovah" or "Yahweh." The Tetragrammaton emphasizes the concept of God's eternal and unchanging nature.