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Re:Gemini PDA: 20 years on, meet the all-new Psion Series 5 by lproven on Friday December 01, 2017 @04:55PM (#15827953)
Are you thinking of OPL?

OPL -- Organizer Programming Language -- was the default Psion high-level language bundled with all their EPOC machines. It's a block-structured BASIC-like language.

Re:Gemini PDA: 20 years on, meet the all-new Psion Series 5 by protomyth on Friday December 01, 2017 @05:17PM (#15828198)
No, I was thinking APL. I gotta look, it might have been one of the ones jecel showed in his comment, but I swear it was smaller.