The Bat-Signal is a fictional distress signal that shines a light into the sky with a shadow in the shape of a bat 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 television shows.
- Brodkin, Jon (2012-07-19). "Internet Defense League creates "cat signal" to save Web from next SOPA". Ars Technica. Retrieved 2012-08-26.