Christian iconography expresses in images the same Gospel message that Scripture communicates by words. Image and word illuminate each other:
We declare that we preserve intact all the written and unwritten traditions of the Church which have been entrusted to us. One of these traditions consists in the production of representational artwork, which accords with the history of the preaching of the Gospel. For it confirms that the incarnation of the Word of God was real and not imaginary, and to our benefit as well, for realities that illustrate each other undoubtedly reflect each other's meaning.
Crosses & Crucifixes
The symbol of the Christianity is the crucifix. It was a sign of extreme depravity and the barbarity of men, but God turned it into the true sign of the nature of His love.
John 3: 14-15:
14 Just as Moses lifted up the snake in the wilderness, so the Son of Man must be lifted up, 15 that everyone who believes may have eternal life in him.”
Rosaries
The Rosary is a beautiful and functional piece of Christian culture. Prayer beads have been used in Christian life since the 3rd century, but the Rosary in the most familiar format evolved from approximately 1000AD to its final familiar form in 1500 AD.
Icons, medals, and trinkets
These Items serve to give us a reminder to praise him who is solely praiseworthy, they call to mind events, ideas and truths in Christianity.
Deuteronomy 11:18-21:
18Fix these words of mine in your hearts and minds; tie them as reminders on your hands and bind them on your foreheads. 19Teach them to your children, speaking about them when you sit at home and when you walk along the road, when you lie down and when you get up. 20Write them on the doorposts of your houses and on your gates, 21so that as long as the heavens are above the earth, your days and those of your children may be multiplied in the land that the LORD swore to give your fathers.