An undesirable visitor to Unsent newsgroup. This person is usually combative and abusive of many of the accepted practices of the Usenet Access Provider. A Troll usually will engage users in an aggressive manner. Possible trolls should be reported to your Usenet newsgroup provider and to the moderator of the newsgroup in which they are provoking and abusing. It is against the TOS of most Usenet access providers to allow known Trolls access to Usenet and specific newsgroups.