The newest Apple phones this year are called the iPhone XS and the iPhone XR.
Apple insists that the "X" stands for the Roman numeral for 10. And the "S" stands for "speed," at least in Apple lore.
But what does the "R" stand for? According to Apple's marketing chief, it has to do with sports cars.
"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," Apple's senior vice president of worldwide marketing, Phil Schiller, told Engadget.
So the "R" could stand for "rally," or "type R," or "road and track," or anything really - there are a lot of cars that use "R" in their branding.
The iPhone XR, which starts at $750 (about R10,800), is slightly less expensive and has lower performance than the iPhone XS or iPhone XS Max, which start around $1,000 (R14,300)
Schiller's latest tweet about his favourite cars didn't list any "S" or "R" models, though he does have a specific taste: fast, rare, and exotic.
"So many favs to choose from: McLaren F1, Aston DB4 GT, Porsche 550A, Ferrari P4, Ford GT/40, Jaguar D-type, Lambo Miura," Schiller tweeted in March 2012.
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