Silver
Silver is a chemical element with symbol Ag (from the Latin "", derived from the Proto-Indo-European "h₂erǵ": "shiny" or "white") and atomic number 47. A soft, white, lustrous transition metal, it exhibits the highest electrical conductivity, thermal conductivity, and reflectivity of any metal. The metal is found in the Earth's crust in the pure, free elemental form ("native silver"), as an alloy with gold and other metals, and in minerals such as argentite and chlorargyrite. Most silver is produced as a byproduct of copper, gold, lead, and zinc refining.
Northern Administrative Okrug
The narrow silver belt symbolizes the Moscow Canal, which passes through the territory of the administrative okrug. The two golden wings symbolize air traffic and the Sheremetyevo International Airport. The silver eight-pointed star represents Polaris and points to the northern location of the administrative okrug in Moscow. The gold and silver sails of the ship symbolize the river transport. The silver horses represent the racetrack. Finally, the silver Corinthian style columns represent the porticos of the Central Moscow Hippodrome.