Oh, there was even a term for that: "еггоглогия" - errorology, or, transcribed from Cyrillic - eggogology (because latin 'r' looks like Cyrillic 'г', pronounced

Oh, there was even a term for that: "еггоглогия" - errorology, or, transcribed from Cyrillic - eggogology (because latin 'r' looks like Cyrillic 'г', pronounced as 'g' in 'go') - basically, the study of undocumented features of programmable calculators. It got popularized in a series of articles in Technology for the Youth magazine in late 80s. They used funny terms for various classes of outside-of-normal-range numbers - like, supernumbers, shapeshifters, darkness, monsters, etc. Those undocumented features were pretty handy for game programming. Here is a Wikipedia article (in Russian): https://ru.wikipedia.org/wiki/%D0%95%D0%B3%D0%B3%D0%BE%D0%B3%D0%BE%D0%BB%D0%BE%D0%B3%D0%B8%D1%8F https://ru.wikipedia.org/wiki/%D0%95%D0%B3%D0%B3%D0%BE%D0%B3...