I keep seeing roshei teivos on the site and, being comparatively uneducated, can't make heads or tails of most of them.
For example, one that I have seen on this site is "PTIJ" (which I assume refers to פתא"י or the like in Hebrew).
There is always a lot of discussion going on about what PTIJ doesn't mean, but no one has said what it does. Since this is a Torah site, I assume it refers to a concept in Torah. So I ask: to what Torah event or concept does פתא"י refer?