ARA, our ARA, has not been around long enough to have a nickname, at this point in the story, she's just ARA. to the crew of these other stations, their ARAs are just ARA, too. But there's only one Apex Frame, and that's 0-1-1.
After the previous Apex ARA has been replaced, ARA has a lot to learn about her new job, and this was meant to be an approach at her meeting just some of the other ARAs for the first time and sharing her information.