| login forms | Refers to pages that require login authentication before a visitor can access the content. |
| keyword phrase anchor links | Links that use keywords or phrases as anchor text. |
| null query | Noun phrase. A null query produces no relevant documents as a search result. Alt. A null query may include only documents with null relevance (q.v.). |
| page impression | The number of times a page is loaded on a browser by web visitors. |
| serp | Stands for search engine results page ? the page you see after conducting a search. |
