Your fingerprints are unique. That means that no one else in the world has the exact same set of ridges and lines that you have on your fingers. Not even identical twins have the same fingerprints.
Psalm 139:14 says that God made all the delicate, inner parts of my body. He knit me together within my mother’s womb. I was made wonderfully complex. God knew me as He was painstakingly designing me with much loving care.
In this context, "fearfully and wonderfully made" means that each individual is intricately and uniquely created by God. It emphasizes the idea that God's craftsmanship in forming and designing human beings is awe-inspiring and extraordinary.