Individual Contributor (primarily makes stuff directly rather than working through other people) and Performance Improvement Plan (supposedly a plan to improve performance, but often actually just HR making sure they have watertight documentation justifying sacking the person).

IC = Individual Contributor

PIP = Performance Improvement Plan

And more realistically Paid Interview Practice.

Individual Contributor and Performance Improvement Plan

Adding on that though some people can come through a PIP and fix whatever problem they were having it usually is a pretext to being fired.

It's called "Paid Interview Prep" for a reason :)