Armon (אַרְמוֹן) refers to a fortified palace or citadel — the inner stronghold of a city, typically the royal residence of a king. It connotes power, security, and the seat of governmental authority. The word appears in poetic contexts celebrating Jerusalem's security and in prophetic judgments against enemy strongholds.
The armon as the seat of human power stands in contrast to God as humanity's ultimate fortress. The psalmists recognize that the security of walls and citadels is nothing apart from God's protection: "Unless the LORD watches over the city, the watchman stays awake in vain" (Psalm 127:1). All human strongholds are subject to His judgment and mercy.