What is FIRE here?

Financial Independence, Retire Early. It's a whole subculture online, based around the idea that if you can grow your investments to ~25X your annual expenses, you can safely stop working and live off those investments.

https://www.mrmoneymustache.com/2012/05/29/how-much-do-i-nee...

In some kind of economic AI apocalypse, though, who knows if the assumptions behind FIRE will hold.