The Bat-Signal is a fictional distress signal that light-up the Bat sign to call Batman and Robin when there's a crime happening or when James Gordon has a lead on a case. Gordon, Harvey Dent, Harvey Bullock, Hamilton Hill, and Barbara Gordon have access to the machine. Many spoofs of the machine are made in many shows.
- Brodkin, Jon (2012-07-19). "Internet Defense League creates "cat signal" to save Web from next SOPA". Ars Technica. Retrieved 2012-08-26.