Here we have a problem, because in truth the numeronym '4D' is used, but as an advertising joke. It would be one more step after 2D ("two dimensions") and 3D ("three dimensions") to name an object made in . . . four dimensions; Something that for those of us who move in a Euclidean universe is too complex. The confusion comes from the promotions of prenatal ultrasounds, which at first were like photographs (2 dimensions, or 2D) and then became scans with the possibility of rotating the image on a screen as if it were an object in 3 dimensions (or 3D) and then a more detailed system was created, with better definition and captures in real time, which advertisers called '4D', assuming that the original numbers were generations of a product and not references to four-dimensional physics or geometry. See tesseract .
