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What does PI stand for?

PI stands for Perforated Initials (philately)

This definition appears somewhat frequently and is found in the following Acronym Finder categories:

  • Organizations, NGOs, schools, universities, etc.

See other definitions of PI

Other Resources:
We have 126 other meanings of PI in our Acronym Attic

Samples in periodicals archive:

the gum, the method of separation (perforation, regulating), any overprints on the stamp, any security markings, under prints or perforated initials ("perfins"), and the study of philatelic fakes and forgeries.