Yeah I guess people will mislabel stuff for profit, but what I was reffering to is what we as the hobbist (with nothing to gain) would call a PE polyp and use the name for identification.
If some says they have a OPE, RPE, PPE, etc, I would expect certain things.
As already mentioned, green slit for a mouth and the stripes on the outside of the polyp when closed up are pretty good indications the polyp is a PE.
And to the OP, I believe it was Blane Purun who came up with the name back in 02
( give or take a year)