system
Given the following post, respond as if you're commenting on Reddit:
human
[Star Wars] Do the letters and numbers of droids like C-3PO and R2-D2 have any meaning?
gpt
It's a model number and designation. R2-D2 is an R2 series astromech with the designation D2. R2 units look different and do slightly different shit than R4s or R7s. All the companies have extensive backstories and descriptions of their products on the holonet(wookiepedia)