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.