icon and symbol cheat sheet

Is there icon for “tag children” or a warning prompt that could be set when the last instance of a file is being deleted from the database?

I am trying to safely delete about 1500 erroneous tags and it would be nice to have some visual indication of which files are connected ONLY with tags. This time I am pretty sure most if not all are indexed files so I should be safe. However, I will double check if I have unindexed duplicates.

Thanks.