PIF, APCs .. What#?

Being a member of a forum it's great fun. I have learned a lot from other members. One thing that is really fun is to get to understand all these acronyms. When you are a member you can participate in or be invited to different types of trading. I'll show some examples.

This is the picture of a card that I sent to Amy in a PIF trading. PIF stands for Post It Forward. A member offers an ATC that she has created in a post and somebody takes it and posts another of hers forward. This is a quick way of getting cards from other members and trade your own cards. Subscribing to thread of this kind is a good way of receiving a message when somebody has offered a card and you can take it. The more you post, the more you get.
I'll explain APCS in the next post.
Please leave some comments if you are playing in some forum or trading cards...