Honestly, 'R124C41' could be a unique term invented by the author for a technology, a character name, or a location. Without more context from the specific work, it's hard to say for sure.
I have no idea. Maybe it's some sort of code or reference specific to a particular sci-fi story or universe.
I'm not sure. It could be a random combination of letters and numbers given a special meaning within the fictional world. You might need to look for clues within the related story or series to figure it out.