- Refers to the period in history and the style of art that developed when the Roman Republic ceased to exist and Rome expanded its territory and was ruled by emperors. The period is generally considered to begin with Octavian's victory at the Battle of Actium in 31 BCE, and to last through the rule of the Severans. For later emperors, see "Late Antique." For the period and culture of the Holy Roman Empire, use "Holy Roman Imperial." Note that some classifications include the Tetrarchic, Constantinian, and the Holy Roman Empire in the "Roman Empire."
- Pure metallic element having symbol Ag and atomic number 47; a malleable, ductile, white metal with characteristic sheen, considered a precious metal. Silver is widely distributed throughout the world, occurring rarely as metallic silver (in Peru, Norway) but more often as silver-gold alloys and silver ore. Today silver is obtained as a byproduct in the refinement of gold, lead, copper, or zinc ores. Silver was smelted from the ore galena as early as 3800 BCE. As a pure metal, silver is second to gold in malleability and ductility, can be polished to a highly reflective surface, and used -- typically in an alloy -- in jewelry, coinage, photography, mirrors, electrical contacts, and tableware.
- Refers to spheres that bear a map of the Earth on their surface. They were first devised by the ancient Greeks, who had calculated that the Earth is a sphere. Modern terrestrial globes are typically mounted on an axle that permits rotation and is tilted 23.5 degrees from the vertical in order to simulate the inclination of the Earth relative to the plane in which it orbits the Sun.
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<ref name=BMC>cite web |url=http://triarte.brynmawr.edu/objects-1/info/159484 |title=Imperial Antoninianus of Rome Issued by Gordian III |author=Bryn Mawr College Library Special Collections |accessdate=9/18/2021 |publisher=Bryn Mawr College</ref>
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