What's the Bluesky version of ".@"?

On Twitter, if you wanted to start a post with someone's username but not make it a direct mention to them (so that your post would be visible to everyone who followed you instead of just people who also follow the person you're tagging), you could just put a period in front of their username. I can't figure out how all that works in Bluesky though. Is there a similar standard way of doing that here?