The П here is uppercase Pi, not P in Cyrillic. The original name of BESM is БЭСМ, Бйстродействуйусхцхайа Електроннайа Сцхотнайа Масхина, i.e. "High-Speed Electronic Computing Machine [0].
Быстродействущая Электронная Счетная Машина. Your Cyrillic seems to be doubly transliterated.
reminds me this hotel receptionist in Russia who, when writing my name down the registration paper (visa reasons), did so with this same double/direct transliteration (eg, "shch" to "схцх"). gave me a funny name in the end, and a good chuckle)
Reminds me of a story: My father's parents were Lithuanian, so I have their surname, but I am American. In 2011 I had a Russian visa for a short trip to Moscow. They transliterated my name in a way that I don't think a Lithuanian travelling to Russia would have. Notably, Š was С and not Ш because the diacritic obviously won't appear on my US passport. I think they also had И where I might have put Й.
That's a very odd way to transliterate, especially considering the shch in Khrushchev is the latinization of the letter щ
Ah so before there was PyPy there was PiPi.
Wow, someone’s really butchered the actual name, Большая/быстродействующая электронно-счётная машина.