According to vocabulary.com:

In the Hebrew Bible, the Land of Israel and the city of Jerusalem are both referred to as Zion. Other religions use the word Zion to mean "utopia" or "holy place."

Zion is a specific, historically important location — the name refers to both a hill in the city of Jerusalem and to the city itself — but it's also used in a general way to mean "holy place" or "kingdom of heaven." The root of Zion is the Hebrew Tsiyon, and while the word holds a special importance in the Jewish faith, it's also used by Mormons and Rastafarians, among other Christian groups, to mean "utopia."

Definitions of Zion noun Jewish republic in southwestern Asia at eastern end of Mediterranean; formerly part of Palestine synonyms:Israel, Sion, State of Israel, Yisrael see more noun originally a stronghold captured by David (the 2nd king of the Israelites); above it was built a temple and later the name extended to the whole hill; finally it became a synonym for the city of Jerusalem “the inhabitants of Jerusalem are personified as `the daughter of Zion'” synonyms:Sion see more noun an imaginary place considered to be perfect or ideal