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Good question. I googled, and it may be "unregretted attrition rate," or URA, which represents the percentage of employees that managers aren't sad to see leave the company — whether they part ways voluntarily or otherwise.

Source: https://www.businessinsider.com/amazon-secret-terms-only-wor...

Unregretted Rate of Attrition.

Within every org of ~100+ people, they stack rank and cut the bottom K%. It used to be 4%. Now it's 7%.

They get put onto a PIP, and very few improve enough to stay.

You can't answer a call to help with alphabet soup and then also add more!

PIP - performance improvement plan

Lol for real.

lol = laugh out loud

Not sure on the accuracy but in a random article it says

The company also has a metric called “unregretted attrition rate” (URA), which represents the percentage of employees it would like to see leave the company – voluntarily or otherwise – in a given year.

https://www.hcamag.com/us/news/general/leaked-amazon-memo-sh...

They may mean "unregrettable attrition".

Unregretted attrition