Aron (אָרוֹן) means a chest, box, or ark. It is used for three major items in Scripture: (1) the Ark of the Covenant — the gold-covered chest containing the tablets of the Law, Aaron's rod, and manna, which represented God's throne on earth; (2) the coffin of Joseph (Genesis 50:26); and (3) the chest used to collect temple offerings (2 Kings 12:9).
The Ark of the Covenant is Israel's most sacred object — the very footstool of Yahweh. Its construction (Exodus 25), its transport, and its placement in the Holy of Holies all speak to the holiness and unapproachable majesty of God. The atonement cover (kapporeth) on the Ark was where the blood was sprinkled on Yom Kippur — a direct type of Christ's atoning work as the propitiation for our sins (Romans 3:25; 1 John 2:2).