What this icon mean?


I have made a git push origin master and I don’t understand why I have this following icon on gitlab, first time seeing it :

When clicking on it, I can’t access what’s inside.

Edition : GitLab Community Edition 12.0.9


It’s a git submodule. It means you are linking that directory to another repository. Probably you don’t have access to the other repository, or the reference is wrong.