Naked Links – A posted and visible link in the text of a web page that directs to a web site.
Negative Keywords – Filtered-out keywords to prevent ad serves on them in order to avoid irrelevant click-through charges on, for example, products that you do not sell, or to refine and narrow the targeting of your Ad Group’s keywords. Microsoft adCenter calls them "excluded keywords." Formatting negative keywords varies by search engine; but they are usually designated with a minus sign.
No Frames Tag - A tag used to describe the content of a frame to a user or engine which had trouble displaying / reading frames. Frequently misused and often referred to as “Poor mans cloaking”.
NoFollow - NoFollow is an attribute webmasters can place on links that tell search engines not to count the link as a vote or not to send any trust to that site. Search engines will follow the link, yet it will not influence search results. NoFollows can be added to any link with this code: “rel="nofollow"."