skyscraper
A skyscraper ad is a tall and narrow banner advertisement usually placed to the right of content on a Web page. Standard dimensions for a skyscraper ad are 160 X 600 pixels. Like another popular type of Internet ad, the leaderboard, the skyscraper offers an advertiser a large space for a message. Unlike the leaderboard, which is usually placed between the masthead (title area of a Web page) and the page's content, a skyscraper remains at least partly visible as the viewer scrolls down the page.