President Donald Trump has a pattern of signing off on social media posts with his full name and title, regardless of what the rest of the post is talking about. Sometimes he posts about tariffs and California Gov. Gavin Newsom (D); other times, he’s celebrating the military or Supreme Court rulings, or ranting about the war in Iran. But no matter the topic, Trump is likely to sign off on a message on Truth Social with “DONALD J. TRUMP, PRESIDENT OF THE UNITED STATES” or “President DONALD J. TRUMP.” Using the RollCall database, HuffPost estimates that Trump has signed his Truth Social posts “President DONALD J. TRUMP” roughly 68 times since June 29 and with “DJT” at least 101 times since May 29. Deborah Tannen, a distinguished linguistics professor at Georgetown University and author of the bestseller “You Just Don’t Understand,” initially compared the sign-off to letter-writing conventions, with formal opening and closing greetings that people sometimes use in text messages, too, when reaching out to someone new or asking for a favor. “[But] it seems to be doing something more,” Tannen told HuffPost, referring to posts where the sign-off feels unnecessary. “My guess would be, especially since it isn’t just his name but ‘President’ and the middle initial — first, he’s treating it as something very public. And second, he’s reminding people that he’s the president.” That reminder is unnecessary, of course, and Trump’s username is already “President Donald J. Trump” on Truth Social. “My guess would be [it’s] to remind people he’s the president and to have the pleasure of seeing ‘President Donald Trump,’” Tannen said. “I think, from the point of view of someone who’s got a big ego, to send it off without a signature [could make them think], ‘Oh, this could be coming from anybody.’” “The ‘President’ and the middle initial — it’s a way of sort of putting himself, as a person, forward, reminding people who he is,” she added.Tannen did note, however, that Trump has signed off in this manner so many times that it might be more of a routine habit than an action loaded with meaning.“If you do something in a routine way, it doesn’t mean anything in particular,” she said. “But if you see something you think is really unusual, you start asking, ‘Why would they do that?’” For younger generations who grew up online, adding one’s name at the end of social media posts and messages that are already clearly labeled and identified is very unusual. Regarding digital communication, “the older you are, the more foreign it is to you,” Tannen said, referencing how proper punctuation, especially periods, can come across as angry or rude to younger people. Getty/Truth SocialIn February, CNN White House Correspondent Alayna Treene posted on X that the president often writes his own posts, but that some aides, such as Natalie Harp and Dan Scavino, do have access to his account and sometimes write for him. “He’ll often sign his posts to indicate he wrote it, with the initials ‘DJT,’” Treene said. Trump has a few other favorite sign-offs on social media. According to the RollCall database, he’s closed with “Thank you for your attention to this matter” about 46 times since May 29. (Trump is no stranger to catchphrases — “You’re fired!” was the focal point of every episode of his NBC show, “The Apprentice.”) Whatever the reason, the habit shows no signs of slowing down. The frequency with which Trump writes out his title and full name may be less about who wrote the post — Treene’s “DJT” shorthand suggests that’s his own quick signal — and more about how the president wants to be seen while reading it back.