When viewing a list of directories via http, a robust site has icons preceding the file/folder name. A folder might have a icon that looks like a folder, a README text file might have an icon that looks like a partially-opened book. I kept running across a sphere with a lit fuse named "bomb.gif." Thought it might be a folder to avoid.
That icon is actually from the Apache httpd icon set installed with the httpd-autoindex module. Its intention is to bring attention to core dumps. However, any folder with "core" in the name also gets the bomb.gif icon. It is defined in extra/httpd-autoindex.conf. Perhaps something the administrator of an Apache based web site might want to change to a regular expression? "[^core$]" comes to mind.
https://svn.apache.org/repos/asf/htt...oindex.conf.in
Something that has been an mystery to me for years finally solved!