Strictly speaking, Angrenost was the old Gondorian name for the entire complex of Isengard, including not just its central Tower, but also its surrounding enclosure and Ring. The central Tower might have been known as Orthanc even during this early period (the name is interpretable as Sindarin 'forked height', but loosely translated 'Mount Fang'). The name Orthanc, however, seems to have been applied by the Rohirrim (orthanc was a pre-existing word in their language, translated in this context as 'cunning mind'). This seems to imply that the Tower may have had a different, earlier name, but if so we have no record of it. In texts relating to the period before the founding of Rohan, the fortifications of Isengard and Orthanc are usually referred to collectively as Angrenost.
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