A virus believed to have been deployed by the The Nova Mob during the time of The Radiant Polity. It targets neurologic downloads of language software.
The virus was named for a quirk (or perhaps a signature) in its code that left its victims unable to speak the words "twenty-three." Instead, they would replace it with a close approximate ("twenty" or "twenty-five," perhaps). The virus was a bit of nanomachinery, phage-delivered into the microbial vector employed to carry the translator code to the brain of biologics. The changes caused a global aphasia and lowered stress tolerance, leading to explosive reactions when communication with anyone was (predictably) ineffective. This reaction was particularly pronounced against Moravecs and Infosophonts, likely by design.
The malware vector was aerosolized, so it spread quickly throughout habitats. Quarantines were put in place, but these were often policed by bots, which only intensified the anger of the populace. It was weeks before the virus was contained in the most places and civil order restored.For years afterward, it was a frequent conspiracy theory in the noosphere that hacks of Enigma 23 existed that were more subtle, that shadowy forces were using it to surreptitiously shape the language (and therefore the thought process) of the populace.