Periphery or Peripheral may refer to:Periphery is an American progressive metal band based in Washington, D.C., formed in 2005. Their musical style has been described as progressive metal, djent, and progressive metalcore.In world systems theory, the periphery countries (sometimes referred to as just the periphery) are those that are less developed than the semi-periphery and core countries.Periphery IV: Hail Stan is the sixth studio album by American progressive metal band Periphery, released on April 5, 2019. It is their first album not to be released on Sumerian Records, as the band parted ways with the label in 2018. The album was independently released on the band’s own label, 3DOT Recordings.Periphery III: Select Difficulty is the fifth album by the progressive metal band Periphery, released July 22, 2016. The opening track, “The Price Is Wrong”, was nominated for Best Metal Performance in the 59th Annual Grammy Awards.Periphery is the debut studio album by American progressive metal band Periphery, signed by Sumerian Records and released on April 20, 2010. Many songs on the tracklist had been written long before the release date—with some written by original lead vocalist Casey Sabol—but due to membership changes, the album was postponed on several occasions.Periphery II: This Time It’s Personal is the second album by the progressive metal band Periphery, released June 29, 2012 through Roadrunner Records Australia and July 3 through Sumerian in America.A periphery, (Fr: couronne) is an INSEE (French demographic statistics institution) statistical area designating a commuter belt around an urban unit (Fr: unité urbaine).