That’s who the postcard was addressed to. The postcard announcing the annual holiday fair of the artifactory / The Artifactory in Palo Alto:
(#1) Arnold M Zwicky has been getting these announcements for a couple of decades, but I believe that this is the first time MARCIA M Zwicky got one and I didn’t (it’s possible that I didn’t notice for a couple of years, because COVID-19, but my replacement by MARCIA M is surely a recent thing)
I suspect that this address is incorrect — it should be MARCIA M M Zwicky, because her full name is MARCIA MARCIA MARCIA Zwicky. As in The Brady Bunch.
Back in the real world, there’s the question of where MARCIA came from, and for that I have no idea, beyond the possibility that the Artifactory’s address database somehow mingled two different addresses, MARCIA + X and Y + M Zwicky.
In the world of consensus reality, there’s the Artifactory cooperative and the tv series The Brady Bunch (though I have to point out that we’re interested in the series for the (fictive) narrative in it, for the stories it tells). And then the fantasies and inventions I’ll spin out will use some other established fictive narratives: the story of the Three Magi and the tales of the Archangel Michael. With a side reference to the comics and graphic novels of Alison Bechdel.
In fact, Bechdel will serve as the entry point into the (real-world) story of the Artifactory cooperative.