OK I've heard Apple marketing refer to it as "the button below the digital crown" or "the button next to the digital crown". That's a mouthful. Apple needs to come up with a name for this button. I'm not sure what to call it if it's multipurpose but their crack product team should be able to come up with something, no?
Watch has 2 buttons instead of one, is it for a purpose that we can click both buttons at once.. to take a screen cap?