In Hebrew, the "heavens" - "Heavens" (שָׁמַ֫יִם = shamayim) are always in the plural. And they have seven names: Dok, Rakia, Shechakim, Zevul, Maon, Machon and Aravot. William J. Morford explains this in the glossary in his Bible translation "The One New Man Bible", which he wrote in close collaboration with Rabbi Eliezer Ben-Yehuda, grandson of Eliezer Ben-Yehuda, whose life's work made Modern Hebrew the national language of Israel.
In the New Testament at 2 Corinthians 12:2, Paul tells us, "I know of a man in Christ that fourteen years ago-whether in the body, I know not, or out of the body, I know not; God knows-that this one was caught up to the third heaven." (Elberfelder Bible)
"In truth, however, heaven is a mystery. We will only see what heaven is really like when we get there. ”