Song of Solomon 4:4 (ESV)

4 Your neck is like the tower of David, built in rows of stone; on it hang a thousand shields, all of them shields of warriors.

The husband compares her neck to the tower of David where many shields are hanging. They are the shields of heroes, reminders of what they have done for the people in the service of God. These shields are a reminder of David’s kingship, which was so blessed. Jewelry hangs around his wife’s neck, which he has given her: evidence and reminders of his love for her in the past.