KISMET Lore Dump: Many robots, including Sigma, communicate using Cipher, a machine language that sounds akin to this.  Most engineers are fluent in Cipher, but laypeople like Sebastian aren't.

Octavia's little drone, called Sigma, is actually an extension of her computer! The strings of numbers/symbols it's speaking are actually translated through a program my brother made for me (thanks 哥哥 😁)--you can read the translated text on my patreon!