* “Windows RT” - no. That’s now normal Windows 10 for ARM, now devoid of that arbitrary restrictions present in “Windows RT” (“Windows: Really Terrible”).
* “WinRT” - yes. That’s the new COM+WinMD platform API added in Windows 8 (and initially only available to “Windows Store apps”) and incrementally improved since then and now part of UWP but it’s existence is weird. Some parts of WinRT are available outside of UWP but it’s a confusing mess.
* “Surface RT” - Yes, the “Surface 2” and then the “Surface Pro X”. Note that the Surface RT and Surface 2 were both locked-down to only run Windows App Store programs whereas the Pro X (and all post-Win10 ARM machines) are not artificially restricted this way.
