What does it mean?

what does mean what ?

ok.. that lock icon.. it means they didn't cleared the validation process yet so the page is locked ( we can't comment on it or do any other action until they cleared it )

That should only be visible to admins

is there another lock icon then ? its the only one i know..

As a non-admin I can confirm the lock appears when one adds unvalidated contributions.

Thanks, I didn't think they were visible to regular posters

How to get validated then? Have to wait?

There are a few titles that the admins are discussing whether they should be approved or deleted.

Just to the one who added the contribution, so he can edit his entries.

Exactly, that's what I meant.

Now, waiting for the validation of my last contribution, a recurring question came to me again.
I was wondering if it would be possible to allow the contributor to post comments on its "waiting to be validated" contributions. I don't know if anyone else but me would find it useful or interesting, but I use to take some extra thumbs that have to wait until the validation to be added. I know maybe there's no available admin or they need time to validate contributions when queued, and that -sometimes long- wait was not a big problem when I had more time, but nowadays I'm a bit busier, and sometimes, when the validation takes a while, if I'm not available for some days, the details or the identification of unidentified cars have to be done without the extra thumbs, and maybe when I get to add the thumbs, days later, the identification comments have no sense any more but keep stuck there.
It could also be useful to let some info to the validating admin.
I don't know if that's technically possible nor if it follows the rules, but I would find it really useful.
Thank you in any case!

Yes, that has been suggested before. It's not practical to have the contributor waiting with thumbnails. I'm not sure there's an easy technical solution.

Problem is that the comments are sorted by date, so if people check latest comment they would either see comments on page not yet validated or (if we exclude these pages from "all comments") maybe never see these comments in the latest comments, as they would already be old when the pages are validated.
(I'm not sure if it is clear?)
Of course these could be stored in a separate table and moved to the real comments table when the page is validated, but I never took time to make that...