Earlier quoted context omitted.
Research grants. That said, Harvard has the largest university endowment in the world, they'd be just fine operating at their current size off their endowment proceeds effectively forever.
For a while it was controversial whether they would even allow themselves to draw from the account itself versus merely funding things from interest.
[1]: https://www.forbes.com/sites/michaeltnietzel/2024/10/17/harv...