Platform 9¾ is the fictional London platform linked to J.K. Rowling’s Harry Potter books.
In the novels, young witches and wizards reach Hogwarts by boarding the Hogwarts Express at King’s Cross station. The hidden platform lies between the ordinary platforms numbered 9 and 10, and passengers access it by passing through the barrier between them.
The fraction symbol is part of the platform’s name, making it one of the most recognizable invented locations in the series. The story uses a familiar railway station as a gateway between ordinary British life and the wizarding world.
King’s Cross Station later installed a Platform 9¾ photo opportunity for visitors. It is a real-world tourist attraction, but the magical platform itself remains fictional. The actual station’s platform layout has also changed, so the books’ precise arrangement should not be treated as a literal station map.