OP - you may want to ask the mods just to delete the thread. It was based on a misperception - that people use HYPSM to connote the Ivies - when in fact people use HYPSM to indicate those 5 specific schools. Moreover, your comment about “do the Ivies change every year based on acceptance rates” suggests you are not really sure what the Ivies are (no, they don’t change every year). I seriously suggest you ask to have it pulled. We all have off days 
Or it could mean Haverford, Youngstown, Pepperdine, Middle Tennessee, and Sam Houston.