Apple probably just thought it sounded cool.
In a shocking twist, it turns out that the extra letters that Apple uses when naming their products don't actually mean anything. We all assumed it but now we've gotten the official confirmation. Complex dissected a new interview that Apple's senior VP of worldwide marketing, Phil Schiller, conducted with Engadget when he confirmed that the extra letters being added to the end of existing product names literally don't mean anything.
The new iPhones being released this week are not too different from their predecessor, the iPhone X. In fact, some have complained that the company is simply releasing the same phone with a different name. Of course, some of the specs have changed and the camera appears to be of even better quality than before, but one of the biggest changes is the name. The introduction of the iPhone XS and iPhone XR a few weeks ago came during a major announcement from Tim Cook and Apple but Schiller explains that the extra letters literally mean nothing in their names. He said the letters "never stand for something specific" before elaborating, "I love cars and things that go fast, and R and S are both letters used to denote sport cars that are really extra special."
The full interview can be read here. The formal release date for the iPhone XR is October 26.