Binary

Binary, also known as Droidspeak, was the droid language composed of electronic beeps, bloops, buzzes, chirps, whines, and whistles. Binary combinations represented actual numbers and whole words.

All droids could "speak" and understand Binary. Some people—such as Revan, Meetra Surik, Kit Fisto, Atton Rand, Bao-Dur, Anakin Skywalker, Cade Skywalker, Luke Skywalker, Wat Tambor, Droma, Kyle Katarn, and Corran Horn—spent so much time with (their) droids that they acquired some fluency in the language, although they were not able to synthesize it. Generally, a whistle ascending in pitch was an affirmative, and one descending in pitch was a negative. It was sometimes possible to understand Binary from the pitch in which it was spoken—notably, expert slicer Zakarisz Ghent displayed an ability to understand the language almost perfectly. It also consisted of a type style that spacers, pilots, and officers often used to identify themselves when speaking to droids via computer databank as well as to ask for safe passage to certain planets to let officials know their ID is authentic.

Text and facts from the “Binary/Legends” article on Wookieepedia, licensed under CC BY-SA 3.0. Modified for this site.