We've have the enigmatic spacex project that was tentatively called the BFR, or Big F[alcon] Rocket. Elon Musk likes to shoot from the hip and the F means something else. Unsurprisingly, they didn't want to issue press releases with that word, so the project has now officially been given a name:
It's not technically accurate (this isn't going to go to another star system) but that's its name. Musk calls it that now. So BFR is no longer correct.
I would suggest we rename the tag to spacex-starship (since [starship] may prove to be too generic in the future) and make [bfr] a synonym