Adwords Display Network: What does 'ROS' (and others) mean?

[soultrain]

I am placing some ads on Google Display Network, and while looking at a list of possible sites for placement, some of the sites have "appears on: ROS" or "appears on: RON". I am wondering what this means? Also, does "multiple locations" mean that the advertisement will show up on multiple locations within the same site, or on different 'advertisement' locations? (i.e. leaderboard, 120x120, etc)


THANKS!!! +rep to all helpful souls

 

[S-dog]

ROS = Run of Site
RON = Run of Network

As far as I know..

 

[bauss]

run on site for multiple locations on that specific website.