What are PIF's?

Excuse me (I am new here!).
Reading through the forums, I came across 'PIF' and wondered what it stands for. I did a search on the site and drew a blank. On Google I also drew a blank as I assume it is not a Public Investment Fund, anything to do with the Pet Industry Federation, nor is it likely to be high grade marijuana (is it?).
Looking up PIF +forum came up with Pacific Island Forum, Poke-International Forums(!), And Portsmouth Interfaith Forum.
I give up, please help.
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