The Y combinator is a fix-point combinator in lambda calculus, typically in languages like Scheme or Lisp.
But I guess that's not what you were asking about, so:
> Y Combinator Management, LLC is an American technology startup accelerator launched in March 2005 which has been used to launch more than 4,000 companies. The accelerator program started in Boston and Mountain View, expanded to San Francisco in 2019, and was entirely online during the COVID-19 pandemic.
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