What is the name of the Imperial probe droid model deployed to search for the Rebel base on Hoth?

In The Empire Strikes Back, the Empire’s long-range recon bot on Hoth is the Arakyd Industries Viper probe droid—identifiable by its bulbous body, multiple sensor arms, and hovering locomotion. Don’t confuse it with Vulture droids, which are Separatist starfighters, or with “Sentinel,” a name tied to Imperial transports or sentry droids rather than probes. “Hound” isn’t a canon probe model used by the Empire in the films. Vader ordered thousands of these scouts across the galaxy; the Hoth unit detected Echo Base’s power signature and transmitted images back to the fleet, enabling the Imperial assault. Its unsettling whale-like calls, array of sensors, and self-destruct behavior (it exploded when confronted by Han and Chewie) underline the Empire’s cold, methodical surveillance tactics that set the stage for the Battle of Hoth.