Realized
The difference between what you paid and what you sold for, on the units you actually sold.
This number is finished. It does not move when the chart moves. It cannot recover, it cannot get worse, and it does not care what the asset does tomorrow. It is the only part of your performance that is genuinely settled, which is exactly why it disappears from holdings screens the moment the position closes.
Property: fixed. Nothing that happens next changes it.