Acronym for 'The Lord of the Rings', the fantasy epic by J.R.R. Tolkien.
Modern acronym from English, formed from the initial letters of Tolkien's masterwork published in three volumes from 1954-1955. The abbreviation became popular with internet communities and gaming culture in the 1990s.
LOTR fans are so dedicated that Tolkien's invented Elvish languages have complete grammars and dictionaries - some people even learn to speak Quenya and Sindarin fluently, making Middle-earth languages more studied than many real endangered languages!
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