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by card_zero 872 days ago
Wikipedia calls these "orphan initialisms", with a couple of citations (halfway down the page for Acronym): "an existing acronym is redefined as a non-acronymous name, severing its link to its previous meaning." But yours is catchier.

Oh, I see they have "anacronym" too, with a fine distinction of meaning. It's the difference between the word officially ceasing to stand for anything, and the public generally forgetting the word stands for.