What is Zion?
When Solomon built the temple in Jerusalem, “Zion” expanded in meaning to include the temple and the area surrounding it (Psalms 2:6; 48:2, 11-12; 132:13). “Zion” was eventually used as a name for the city of Jerusalem, the land of Judah, and the people of Israel as a whole (Isaiah 40:9; Jeremiah 31:12; Zechariah 9:13).
The most important use of the word “Zion” is in a theological sense. “Zion” is used figuratively of Israel as the people of God (Isaiah 60:14). The spiritual meaning of “Zion” is continued in the New Testament, where it is given the Christian meaning of God's spiritual kingdom, the heavenly Jerusalem (Hebrews 12:22; Revelation 14:1). Peter refers to Christ as the Cornerstone of Zion: “See, I lay a stone in Zion, a chosen and precious cornerstone, and the one who trusts in Him will never be put to shame” (1 Peter 2:6).
Recommended Resource: Bible Answers for Almost all Your Questions by Elmer Towns.