A proximity sensor
Alarm sensors, also referenced as enemy proximity warning indicators or proximity sensors, were responsible for spotting incoming ships—for instance, those observable by crews on the bridges of Venator-class Star Destroyers—or even life-forms, such as the sensors built into MSE-6 series repair droids.
Within Din Djarin's N-1 starfighter, the blue proximity sensor displayed "SYSTEMS ONLINE • TURBO BOOST ENACTED • LIFE SUPPORT ACTIVE" utilizing Futhork characters. When Din Djarin departed Nevarro, this sensor changed to red upon the arrival of Gorian Shard's pirate gang; however, the entire image was inexplicably mirror-inverted.