At the Greek Orthodox Patriarchate. The church is dedicated to St. George. A group of visitors attended a service and then had their pictures taken by the priests.
I was informed this is a Christian symbol from the Byzantine Empire. it can be seen in different places. The letter B stands in the Greek letters for V. The 4 Vs stand for: "Vasilev, Vasilevondon, Voeithee, Basielee" which means: " King of Kings ( meaning God), help the King." The Symbol was taken from the sign that Konstantine the Great saw in the sky IC XC NI KA= Jesus Christ in this conquer, the eve of a battle of Milvian Bridge in 312 AD and later during the Byzantine Empire the words were replaced with the 4 V s.