From Citizendium, the Citizens' Compendium
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- Diamond : A stable allotrope of carbon where the carbon atoms are arranged in an isometric-hexoctahedral crystal lattice, commonly used in industrial applications and jewelry.
- Hadrian's Wall : Ancient Roman wall, 118.3 km (73.5 mi) long, across northern England, built during the reign of the emperor Hadrian c. 122–126 and extended by Severus a century later, the wall marked the northern defensive boundary of Roman Britain.
- Nintendo : A leading manufacturer of consumer electronics, especially video games and video game consoles; based in Japan.
- Personal computer : A computer whose price, size, and features make it suitable for personal use.