A 3D model of Platform 9 3/4 is a digital representation of the iconic train station platform from the Harry Potter series. This model is typically created using 3D modeling software such as Blender or Maya, and can be highly detailed to capture the unique design and atmosphere of the platform.

The model includes the central platform, which features a brick archway with a sign for Platform 9 3/4, as well as the surrounding area, including the train tracks and the adjacent station buildings. The platform itself may include details such as the red brickwork, the iron columns, and the wooden benches, while the surrounding buildings may include features such as the arched windows, the slate roofs, and the clock tower.

The 3D model of Platform 9 3/4 may also include various elements that add to the realism and sense of atmosphere, such as steam billowing from the Hogwarts Express as it pulls into the station, or the bustle of the crowds of witches and wizards making their way to the platform.