The encyclopedia is fallaciously called The Anglo-American Cyclopaedia (New York, 1917)
In the story, an encyclopedia article about a mysterious country called Uqbar is the first indication of Orbis Tertius, a massive conspiracy of intellectuals to imagine (and thereby create) a world known as Tlön.
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Today, one of the churches of Tlön Platonically maintains that a certain pain, a certain greenish tint of yellow, a certain temperature, a certain sound, are the only reality. All men, in the vertiginous moment of coitus, are the same man. All men who repeat a line from Shakespeare are William Shakespeare.
{ J. L . Borges, Tlön, Uqbar, Orbis Tertius, 1940 | full story | PDF }