Is it ensure, insure, or assure?
The heroic age of hackerdom (roughly, pre-1980); the era of the PDP-10, TECO, ITS and the ARPANET. This term has been rather consciously adopted from J. R. R. Tolkien's fantasy epic "The Lord of the Rings". Compare Iron Age. See also elvish and Great Worm. [Jargon File]