Penny Napoleonic Wars prompted the use of base metals in 1797. Despite the decimalization of currencies in the United States and, later, throughout the British Commonwealth, the name remains in informal use. No penny is currently formally subdivided, although farthings (¼ d.), halfpennies, and half cents have previously been minted and the mill (1/10¢) remains in use as a unit of account in some contexts. "Penny" is first attested in a 1394 Scots text, a variant of Old English ', a development of numerous variations including ', ', and '. The etymology of the term "penny" is uncertain, although cognates are
Old Quarter, Hanoi each specialized in one particular trade. It was then surrounded by a defensive wall with several gates. During the Lê dynasty, the area included several lakes and wetlands, the largest of which was Thái Cực lake. These lakes, as well as the Tô Lịch River were connected with Hoàn Kiếm lake and the Red River. Near the end of the 19th century these lakes and rivers became isolated from each other. During the Lý and Trần dynasties, many people from the surrounding plains migrated to the city and settled in what is now the Old Quarter, creating the densest urban