For an explanation of Jehovah/YHWH see also: God? What’s in a Name.
The Hebrew word for “shield” is” magen.” It is a shield of any size, full size or buckler. In Biblical usage, a shield can be used for defense, decoration, or an indication of wealth.
In the 3rd Psalm David expresses his great distress when fleeing his son Absalom. [c.f. 2 Sam. 15] David had few left who were loyal to him. He complains that his enemies claim that even God will not help him. But David understands there is no help for David except the LORD.
“But thou, O LORD, art a shield for me; my glory, and the lifter up of mine head.” Psalm 3:3
The “LORD our shield” denotes divine protection. It is not the great and powerful that the Lord shields, for David is no longer king. He is running for his life. In worldly ways he is a disgrace, his crown has fallen from his head, his honor among men is gone.
Solomon decorated his palace with 300 shields of gold.
And he made three hundred shields of beaten gold; three minas of gold went into each shield; and the king put them in the House of the Forest of Lebanon. 1Kings 10:17
In this our Kingdom Age or Church Age, in the past, the congregation of the Lord has often faced great persecution. Great wars have been fought to force people to worship different deities in the way Popes and Kings wish people to worship. Many laid down their lives for the freedom to worship what had how they saw fit. The shield of their souls was the LORD himself.
For the LORD God is a sun and shield; he bestows favor and honor. No good thing does the LORD withhold from those who walk uprightly. Psa. 84:11
The sun is the source of all light on earth. Throughout the Bible, the light of God’s face shines on all that love Him.
After these things the word of the LORD came to Abram in a vision, “Fear not, Abram, I am your shield; your reward shall be very great.” Gen. 15:1
. . . my God, my rock, in whom I take refuge, my shield and the horn of my salvation, my stronghold and my refuge, my savior; thou savest me from violence. 2Sam. 22:3
Thou hast given me the shield of thy salvation, and thy help made me great. 2Sam. 22:36
Is our God just an ornament that we display? Or is He our protector in times of stress and danger? Is your shield a useful tool or just decoration?