A WikiGnome is a creature who, quietly and un-obtrusively, makes many small improvements to a WikiWiki. A WikiGnome will not necessarily add content, instead adding links, correcting spelling mistakes, toning down WikiTrolls and making clarifications.

If more than 10% of your wiki edits are correcting TextFormattingRules or spelling mistakes in other people's edits, you need to look in the mirror to see whether you're a WikiGnome.

Attachment Gnoming:

FAQAttachments says only admins can delete attachments -- StuartYeates

While you may not be able to delete offensive attachments, you can attach another file with the same name to replace a troubling attachment. Note that you can't attach an empty (zero byte size) file. -- JMiner