X9 means hard finger, gossiper, snitch, big-tongued between others. This expression originated in American comic books, first published in newspaper strips, in 1934. Detective X-9 was an undercover agent who worked at an unnamed agency, later renamed the FBI, during a period when that agency enjoyed popularity.
In Brazil, these Agent X9 comics began to appear in the 40s and were published until the 70s. The actions of Agent X9 were featured in a television series in 1937 and in a 1945 film starring Lloyd Bridges.
X9 was also the name given to the inmates of the extinct Carandiru prison, in São Paulo, who were in Pavilion X9, who were police informers, who they received a prize statement, and also those responsible for heinous crimes, such as kidnapping and rape, that if they stayed together with the other prisoners they could be dead.
X-9 agent
X-9 Agent is stealth spy software that invisibly records everything typed on the computer keyboard and every website visited.
The software can be used to monitor all internet access from a particular machine and is not detected by the computer user. It has a filter that prevents access to unwanted websites.
All tracked information is sent, as a report, to the inspector's email. The X-9 also captures webcam images.