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I'm pretty sure it is for showing your own work, but I wouldn't worry about it. The "Show" label is relatively minor, and this is certainly an interesting project to share!

There's a link to the rules/guidelines at the top of the "show" page:

https://news.ycombinator.com/showhn.html

> Show HN is for something you've made that other people can play with. HN users can try it out, give you feedback, and ask questions in the thread.

Thanks for the explanation, won't make the same mistake twice, this was my first submission ever on HN.

Show HN's definitely have a prestige because we think it's the author's debut of the project, feel like we're helping out a community member, and expect them to be fielding answers in the comments.

Else everything is a Show HN. Like Show HN: Google's new privacy policy. ;)

Yep, that's definitely the case. It's not the end of the world, but, generally, don't use "Show HN" to highlight work that isn't yours.