The obvious answer is the symbolism of the trinity; God the Father, God the Son, and God the Holy Ghost. However it has another meaning for me too. When my husband and I married many years ago, I remember learning Ecclesiastes 4:12 …”a cord of 3 strands is not easily broken.” We base our entire life on this, having Christ at the center of our marriage so we can better love one another and also our children. As we face this world, we want to be strong, the only way is to have Christ woven into every aspect of our life. When all 3 are added together, unity is created and we become one.