A Geiger counter is an electronic device primarily used to detect and measure ionizing radiation, such as alpha, beta, and gamma rays. In cybersecurity, the term is sometimes used metaphorically to describe tools or systems that detect and measure digital threats or anomalies, much like a Geiger counter detects radioactive particles. These cybersecurity 'Geiger counters' help organizations identify, quantify, and respond to potential cyber threats by continuously monitoring network traffic, system behavior, or files for suspicious activity, providing early warnings and aiding in incident response.