NATS warning light 3
https://getcarkeysymbolnissaninsider.clearminster.com/posts/understanding-the-car-with-key-symbol-nissan-dashboard-warning
The NATS warning light, typically a yellow or amber indicator on an aircraft's instrument panel, illuminates to alert the pilot of a fault or abnormal condition within the National Airspace System or related communication equipment, such as a transponder issue or loss of signal. It serves as a critical prompt for immediate procedural checks.