RE: https://wandering.shop/@cstross/116860752476719057 Potter Scientific Instruments Or Nothing, they said it stood for. I visited Psion Software multiple times in London in the 1990s - one of their locations was the upstairs of a garage with a hand-painted Psion sign. The Psion EPOC32 used in the Nokia 9210 Communicator later became the Symbian OS.