What are the dots used for horizontal scrolling called? These light up to show what screen the user is on.
Most of the developers in my company referred it as "android pagination indicator" or "Page Indicator"
you can see some example over here:
you can also check some android patterns over here: http://www.androidpatterns.com/uap_pattern/horizontal-scrolling-page-indicators
I would refer to these as "pagination buttons". The content is paginated, and these are buttons which can be used to move between each page. These usually (but not always) have an active state when the page they link to is the currently visible page.