By repositioning the letters around the central letter "Ν" (en), a Greek cross can be made that reads "Pater Noster" (Latin for "Our Father", the first two words of the "Lord's Prayer") both vertically and horizontally. The remaining letters – two each of "A" and "O" – can be taken to represent the concept of Alpha and Omega, a reference in Christianity to the omnipresence of God. Thus the square might have been used as a covert symbol for early Christians to express their presence to each other.