What's the most expansive version of pi that has an assignee Dewey Decimal classification? I would certainly expect 003.14 to have one, but what about further digits? (Also for clemency, where is pi itself classified?)
003.14 is unfortunately unassigned, but it falls under 003.1 which is for computer system identifications
031 is for encyclopedias and factbooks
314.15 is for general statistics of the island of Ireland (looks like that's the most digits available)
the mathematical concept of pi would fall under 516 for geometry (516.152 for circles)