The "Rule of 5," formally known as the 5-4-3-2-1 Grounding Technique, is a mindfulness exercise used to pull someone out of a panic attack or high-anxiety state by re-engaging their five senses. It works by forcing the brain to focus on the immediate physical environment rather than internal racing thoughts. First, you identify 5 things you can see (e.g., a chair, a bird, a cloud). Next, identify 4 things you can touch (e.g., your shirt, the table, your hair). Then, acknowledge 3 things you can hear (e.g., traffic, a clock ticking, your own breath). Follow this with 2 things you can smell (e.g., coffee, old books, or even the air). Finally, identify 1 thing you can taste (e.g., a piece of gum or the inside of your mouth). In 2026, this technique remains a staple of Cognitive Behavioral Therapy (CBT) because it effectively "short-circuits" the fight-or-flight response, grounding the individual in the present moment and providing a sensory distraction that allows the nervous system to begin regulating itself again.