Explain what is meant by the term 'hot signal' in programming or systems.

The term "hot signal" in programming or systems usually refers to a signal or event that requires immediate response and real-time processing.

In the context of iOS and other systems, it can be a hardware or software signal that cannot be ignored or deferred, such as an interrupt, a critical error notification, or a security-related event.

Handling hot signals often occurs in special handlers (interrupt handlers), which have high priority and minimal latency.