Christos - developed symbols for representing Christ (i.e. Christograms) - for example, the Chi Rho symbol - formed by superimposing the first two Greek letters in "Christ" ( Greek : "Χριστός" ): chi = ch () and rho = r (), to produce ☧. Lord Early Christians viewed Jesus as "the Lord" and the Greek word Kyrios (κύριος) which may mean God, lord or master appears over 700 times in the New Testament, referring to him. In everyday Aramaic, Mari was a very respectful form of polite address, well above "Teacher" and similar to Rabbi. In Greek this has at times been translated as Kyrios. While the term Mari expressed the relationship between Jesus and his disciples during his life, the Greek Kyrios came to represent his lordship over the world. Pauline writings further established the various theological consequences of the Lord/Kyrios concept among early Christians, and emphasized the attributes of Jesus as not only referring to his eschatological victory, but to him as the "divine image" (Greek eikōn) in whose face the glory of God shines forth. In Romans 10:9–13 Paul emphasized the salvific value of the title, and stated that confessing by mouth (homologeo) the belief that Jesus is Lord (Kyrion Iesoun) signifies one's salvation. The high frequency of the use of the term Kyrios in the Acts of the Apostles indicates how natural it was for early Christians to refer to Jesus in this way. This title persisted among Christians as the predominant perception of Jesus for a number of centuries. The use of the Kyrios title for Jesus is central to the development of New Testament Christology, for the early Christians placed it at the center of their understanding and from that center attempted to understand the other issues related to the Christian mysteries. The question of the deity of Christ in the New Testament is inherently related to the Kyrios title of Jesus used in the early Christian writings and its implications for the absolute lordship of Jesus. In early Christian belief, the concept of Kyrios included the Pre-existence of Christ for they believed that if Christ is one with God, he must have been united with God from the very beginning. The title, even in the Greek form, continues to be widely used in Christian liturgy, e.g. in the Kyrie eleison, Christe eleison combination (i.e. Lord have mercy, Christ have mercy), where Jesus is