Q1. If a smartphone, like the Galaxy S3, boasts a screen resolution of 1280x720 while its actual screen size by "true" pixels is 360x640—what do you call the 360x640 if the 1280x720 is the resolution?

Q2. When developing responsive websites using the meta viewport tag, like this one:

Code:
<meta name="viewport" content="initial-scale=1.0, user-scalable=yes, width=device-width">
Will the browser always apply it to the "true" size of the screen (the 360x640) and never the touch device's often-faux resolution (i.e. Retina that just cuts pixels into quarters)?

Q3. Can a 4" touch device, for example, ever cram more pixels into its screen than it already has now? Or is splitting pixels like they're now doing the only way to increase resolution without increasing the physical size of the device?

Q4. I don't know much about the physical technology of pixel display but is the size of a pixel the size of a pixel no matter what piece of technology its on? Do all televisions, even the most expensive ones today, use pixel technology?