See Isaiah 18. Verse 7.
Mount Zion is the place of the name of the Lord of Hosts! Zion is mentioned many times in places I've been in recently in Psalms, and in other places in the Bible, like around here in Isaiah.
It speaks to me of the close fellowship between Christians including myself and the Lord Jesus. This fellowship brings us spiritually into His presence today, and will bring us to see Him i2i forever! Zion, His presence, is the place of fullness of Joy! One of my chief joys is that He's forgiven my sins, taking them all away!