What does the rainbow around the throne symbolize?

In Revelation 4, the rainbow surrounding the throne symbolizes God's covenant faithfulness and mercy towards His people. Just as the rainbow post-flood served as a reminder of God's promise not to destroy the earth again (Genesis 9:13-15), the rainbow in heaven reminds believers of the everlasting covenant ordered in all things, ensuring that God's wrath has been satisfied for those in Christ. This imagery reassures believers of their salvation and the security they have in Christ, as seen in Romans 8:1, declaring that there is now no condemnation for those who are in Him.