platinum triangle
n.— «He knows of at least 20 20,000-plus square-foot homes under construction or about to break ground in what he called the “platinum triangle” of wealthy areas in Los Angeles County: Beverly Hills, Bel-Air and Holmby Hills.» —“Mega-mansions are L.A.‘s really big show” by Jessica Garriso Los Angeles Times June 12, 2008. (source: Double-Tongued Dictionary)
Further reading
Enthusiastic book recommendations! Martha’s savoring the biography of Alexander von Humboldt, the 19th-century explorer, polymath, and naturalist who revolutionized our understanding of nature and predicted the effects of human activity on...
Aaron in Los Angeles, California, notes while using public transit in Britain he and other passengers were instructed to alight from the front, meaning “exit the car from the front.” Alight comes from an Old English word alihtan, literally, to...