The symbol for the pocket infinity perk is found on the rasputin grimoire card, and said symbol is found on the anamoly map on the moon in pvp. My guess is that PI itself is a Golden age weapon, created by the same people or secret company who may have built Rasputin.
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But if you read the pocket infinity card it's said it was crafted from vex engineering and they thought that it harnesses its power from Vex
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Very interesting. Gotta check that out.