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PSION was founded in 1980 by David Potter with the PSI part standing for "Potter Scientific Instruments". It started off as a software manufacturer with close ties to Sinclair and entered the PDA and handheld market thereafter.

198?–1984[]

PSION Original

This logo was used in PSION's early days as a software maker for Sinclair's ZX and QL computers.

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1984–2011[]

Psion logo

This logo was used on PSION's handheld devices and on later software releases for Sinclair.

2011–present[]

Psion 2D logo 2011

On January 31, 2011, Psion announced that it had dropped "Teklogix" from its corporate name and introduced a new visual identity.

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