Usually horizontally aligned. Left or right of the text. Yes, reveal items and leaf node icons in the reveal list are this. Others maybe, so go find them.
Good one: Using icons for content type, whether PDF icon or an avatar image, is a type of this... Make this make sense with the list style that describes it already.
NEVER just put text down without link styling or an indicator!
Within any context, an action must be initiated, information submitted, a link followed to more information, or a state change carried out on the current page..
The Indicator pattern is a type of action initiator between a Link and a Button. There is significant overlap between these three patterns, and the Icon pattern; there are some cases where the decision as to which to use is up to consistency and style.
xxxx Between the link and icon. If it has an arrow next to it (iOS loves triangles and GT/LTs), to indicate it goes somewhere, etc. Does not include add-ons (off site icon) if a link. This is for the special case where THIS is the indicator (get it) that there's something the associated text does. xxxx