Strong Arm in the Bible means to symbolize God's power and involvement in the world.
The phase strong arm is used to describe God's use of his power on behalf of Israel, especially during the Exodus.
It also appears in the Bible multiple times which includes.
Exodus 6:6: God tells Moses that he will accomplish deliverance with "an outstretched arm"
Deuteronomy 4:34: Moses reminds the people that God led them out of Egypt with "an outstretched arm"
Deuteronomy 5:15: Moses reminds the people that God brought them out of Egypt with "an outstretched arm"
The Lord's arm.
The Bible refers to the Lord's arm at least 40 times, often to symbolize his spiritual strength or power.
For example, in Isaiah 52:10, it says, "The LORD hath made bare his holy arm in the eyes of all the nations".
God's right arm.
The Bible refers to God's right arm as his powerful, ruling arm, representing his justice, holiness, and strength.
The human arm is also often used in the Bible to symbolize spiritual strength or power.
The word is also first used in Jacob's dying prophecy concerning his beloved son Joseph: “But his bow abode in strength, and the arms of his hands were made strong by the hands of the mighty God of Jacob” (Genesis 49:24).