Have you seen WW1984? Do you refer to it that way? It's better known as Wonder Woman 1984, but the onscreen title is WW84.
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It's a reversal of what sometimes happens, where a title is abbreviated for marketing purposes - like Independence Day being nicknamed ID4 - referring to US Independence Day being on July 4, not that the movie is the fourth in the series (presumably that would be ID4:4 ).
X2 (onscreen) is probably better known by its marketing title X2: Mutants United.
Such differences are not new. The onscreen title of Sunset Boulevard (1950) is Sunset Blvd., the movie beginning, quite literally, in the gutter, where the words are stencilled.
Possessory credits pose their own issues. I've never heard anyone refer to Mario Puzo's The Godfather or Peter Shaffer's Amadeus, even though that's how they appear on screen, in the same frame. Tim Burton's The Nightmare Before Christmas was so titled though the director was Henry Selick: Burton created the characters and is obviously the bigger name.
Stephen King's name is often, with his acquiescence, used to promote movies based on his works and sometimes appears to be part of the onscreen title, for example Stephen King's The Langoliers. But King sued to have his name removed from Stephen King's The Lawnmower Man, arguing it deviated too much from his short story. King won initially but on appeal the onscreen title was allowed to remain but his name was not to be used in advertising, though the filmmakers continued to do so. A $2.5 million settlement was reached.
Sometimes it's styling - Seven or the onscreen Se7ven? The Artist or the onscreen "The Artist"? Many films use quotation marks around the title on screen.
Is the 1984 comedy Ghostbusters (ads) or Ghost Busters, since one word appears above the other on screen?
Some movies don't show the title until well into the film (The Departed) or during the end credits (Batman Begins). Apocalypse Now in its original release only had its title appear as a piece of graffiti during the film.
Whatever the legal position, for most of us, common usage prevails.