Psion is company that developed the Psion Organiser, and other Personal Digital Assistants:
The company Symbian was spun off in June 1998.
Psion has since then largely abandoned the enduser-market,
and concentrated on equipment for mobile data-aquisitation,
heavy-duty and industrial envionments.
Psion also developed games and utilities for the ZX Spectrum during the 1980s. The software was often released by Melbourne House.
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In high energy physics the Psion is a meson, now normally called J/Psi to reflect its independent discovery and naming by two groups of scientists in 1974.