For those less aware of some Chinese tech companies' working schedules, 996 refers to the practice of coming in at 9am, leaving at 9pm, 6 days a week (996). There's also a joke about 007 (ie. stay at the office all the time).

Apparently, https://996.icu/ got blocked somehow. If you can view the website, the top right link allows you to switch the text to English (and a few other languages), in case you want to read the content.

See the English README for the Github repo here (explains the cause): https://github.com/996icu/996.ICU/blob/master/README_EN.md

That URL no longer works; I believe the file has been renamed. New URL: https://github.com/996icu/996.ICU/blob/master/README.md