Question: What is the coat of arms of the largest metropolitan area by population in the country AGT is from based on?

Saint Petersburg (Russian: Санкт - Петербу́рг, tr. Sankt - Peterburg, IPA: (ˈsankt pjɪtjɪrˈburk) (listen)) is Russia's second - largest city after Moscow, with 5 million inhabitants in 2012, part of the Saint Petersburg agglomeration with a population of 6.2 million (2015). An important Russian port on the Baltic Sea, it has a status of a federal subject (a federal city). <SEP> the population of paris in its administrative city limits was 2,241,346 in january 2014. this makes paris the fifth largest municipality in the european union, following london, berlin, madrid and rome. eurostat, the statistical agency of the eu, places paris (6.5 million people) second behind london (8 million) and ahead of berlin (3.5 million), based on the 2012 populations of what eurostat calls "urban audit core cities". the paris urban area, or "unité urbaine", is a statistical area created by the french statistical agency insee to measure the population of built-up areas around the city. it is slightly smaller than the paris region. according to insee, the paris urban area had a population of 10,550,350 at the january 2012 census, the most populous in the european union, and third most populous in europe, behind istanbul and moscow. the paris metropolitan area is the second most populous in the european union after london with a population of 12,341,418 at the jan. 2012 census. <SEP> charleston is the oldest and largest city in the u.s. state of south carolina, the county seat of charleston county, and the principal city in the charleston -- north charleston -- summerville metropolitan statistical area. the city lies just south of the geographical midpoint of south carolina's coastline and is located on charleston harbor, an inlet of the atlantic ocean formed by the confluence of the ashley and cooper rivers. charleston had an estimated population of 134,385 in 2016. the estimated population of the charleston metropolitan area, comprising berkeley, charleston, and dorchester counties, was 761,155 residents in 2016, the third - largest in the state and the 78th - largest metropolitan statistical area in the united states. <SEP> The heraldic emblem of Moscow has been an integral part of the coat of arms of Russia since the 16th century. The coat of arms of Moscow depicts a horseman with a spear in his hand slaying a basilisk and is identified with Saint George and the Dragon. <SEP> Football for Friendship (Russian: ФУТБОЛ ДЛЯ ДРУЖБЫ) is an annual International Children’s Social Programme implemented by Gazprom Company. The aim of the  programme is to cultivate respect for different cultures and nationalities in children from different countries through football, to promote essential values and interest in a healthy lifestyle for the younger generation. Within the framework of the programme , football players at the age of 12 from different countries take part in the annual International Football for Friendship Childrens Forum, Football for Friendship World Championship, International Day of Football and Friendship The programme is supported by FIFA, UEFA, UN, Olympic and Paralympic Committees, governments and football federations of different countries, international charities, public organizations, leading football clubs of the planet. The global operator of the programme is AGT Communications Group (Russia).