The Eastern Orthodox Church is the second largest Christian church worldwide with 225-300 million adherents. It teaches that it is the church established by Jesus Christ almost 2,000 years ago. Depictions of the cross are common in Orthodox churches and carry significance, such as the popular Tri-Bar cross seen in Russia and Ukraine dating to the 4th century AD. Traditions in Orthodoxy consist of following the Bible, symbols, decisions of church councils, liturgical books, icons, and canons as a cohesive religious system. Services follow a rigid annual schedule and require at least two people, a priest and chanter. The goal is for Christians to continually draw nearer to God through imitation of Christ and prayer until united with