WordPress can @mention a user
I haven’t heard a dang thing about it, but apparently it’s possible to reference anyone who is a registered user of your WordPress site using @mentions.
If you’re wondering what the heck an @mention is, it’s the same sort of thing you’d use to reply or mention another Twitter user in a tweet.
In WordPress, it’s done directly in the post block editor. Type
@ and a contextual menu pops up that suggests matching users that autocomplete when selected.
I’m honestly not sure what this is useful for! From what I can tell, it merely prints the person’s username. No links. No notifications. Just plain text.