[drvdevd]

I would say it depends on your position in your place of work, but there are multiple examples of this. I prefer historical ones, say for example NANP (the North American Numbering Plan).

I'm not sure what country you're in, but here, these 10 digit numbers and their various prefixes (NPAs AKA "area codes") are literally burned into the consciousness of most citizens, without them even realizing it. Additionally, all modern cellular services here are still following it in some sense or other, making it an example of highly entrenched technical debt. I'm pretty sure that the design of this system bled heavily into most other countries' telephone networks as well.

A small number of engineers probably drew up this plan on a chalkboard in the 1940s at AT&T, without a clue as to the magnitude of future ramifications.