PI

From Traveller Wiki - Science-Fiction Adventure in the Far future

Abbreviation for 'Pre-Imperial', used to denote dates and (especially) centuries before Year 0, e.g. '12th Century PI' is the years from -1299 to -1200. Dates are usually indicated by the use of the negative sign, but '1299 PI' is an acceptable alternative.

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– Library Data (A-M)