The Hebrew noun qir (קִיר) means a wall — particularly the wall of a building, house, or city. It appears about 74 times in the OT. It is distinct from the outer city wall (chomah).
Qir (wall) appears in architectural descriptions of the tabernacle, temple, and private homes, but also carries theological significance. God's protective presence is compared to a wall: Zechariah 2:5 — 'I will be a wall of fire around her, and I will be its glory within.' Ezekiel's judgment against false prophets compares them to people whitewashing a flimsy wall — it looks strong but will collapse in the storm (Ezekiel 13:10–16). Nehemiah's rebuilding of Jerusalem's walls was a spiritual act of restoration — it marked the renewal of the city of God. In Ephesians 2:14, Christ 'destroyed the barrier, the dividing wall of hostility' (Greek mesotoichon) between Jew and Gentile — the greatest wall-removal in history.