This R&D language was an internal test language used by the Tarkin Initiative base where the BT-1 assassin droid was created. As a result, the blastromech prototype's core identity only spoke this droid language and could not be activated without it. It was seemingly lost when BT-1 destroyed the base after killing the personnel in a homicidal rampage. However, the assassin droid 0-0-0, another product of the Tarkin Initiative, was fluent in all its internal test languages, including the base's R&D language, and was able to reactivate BT-1.
- Darth Vader 3: Vader, Part III (First appearance)