Stat rosa pristina nomine,
nomina nuda tenemus.
Since the publication of The Name of the Rose I have received a number of letters from readers who want to know the meaning of the final Latin hexameter, and why this hexameter inspired the book's title. I answer that the verse is from De contemptu mundi by Bernard of Morlay, a twelfth-century Benedictine, whose poem is a variation on the "ubi sunt" theme (most familiar in Villon's later "Mais ou sont les neiges d'antan"). But to the usual topos (the great of yesteryear, the once-famous cities, the lovely princesses: everything disappears into the void), Bernard adds that all these departed things leave (only, or at least) pure names behind them. I remember that Abelard used the example of the sentence "Nulla rosa est" to demonstrate how language can speak of both the nonexistent and the destroyed. And having said this, I leave the reader to arrive at his own conclusions.
Umberto Eco, Postcript to The Name of the Rose