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I think I see what is going on here.
The 1848 parliament referred to the trisceles-with-Gorgoneion as "il segno della Trinacria", i.e. the "emblem of Sicily", using an archaic name for Sicily. From there, the misunderstanding arose that the symbol itself is called Trinacria.
This is a misunderstanding, just as if, say, we would call St. George and the Dragon the "emblem of Albion" (referring to England by its archaic name), and then people begin to assume that the dragon-killer was called "Albion".
The question here is when this happened, this is possibly just an online phenomenon occurring after the introduction of the flag in 2000, sources are needed.
--dab(𒁳)11:41, 27 February 2020 (UTC)[reply]