6. A method performed by data processing apparatus, the method comprising: receiving one or more characters from a user; transmitting the one or more characters to a forking engine; receiving, from the forking engine, data identifying (i) an auto-completion that corresponds to the one or more characters, and (ii) at least a first corpus, selected from a set of multiple corpora, that is associated with the auto-completion and to a first corpus score that satisfies a threshold and a universal search corpus that includes two or more of the multiple corpora and excludes the first corpus; and providing, for display in a drop down menu and to a user device, a first drop down entry that indicates a first representation of the auto-completion and that includes an icon representing the first corpus adjacent to the first representation of the auto-completion, and a second drop down entry that indicates a second representation of the auto-completion that corresponds to the universal search corpus and that excludes the icon representing the first corpus, wherein the universal search corpus includes two or more of a web search corpus, a places search corpus, a literature search corpus, a patent search corpus, an images search corpus, a videos search corpus, a news search corpus, a shopping search corpus, and a blogs search corpus.
6. A method performed by data processing apparatus, the method comprising: receiving one or more characters from a user; transmitting the one or more characters to a forking engine; receiving, from the forking engine, data identifying (i) an auto-completion that corresponds to the one or more characters, and (ii) at least a first corpus, selected from a set of multiple corpora, that is associated with the auto-completion and to a first corpus score that satisfies a threshold and a universal search corpus that includes two or more of the multiple corpora and excludes the first corpus; and providing, for display in a drop down menu and to a user device, a first drop down entry that indicates a first representation of the auto-completion and that includes an icon representing the first corpus adjacent to the first representation of the auto-completion, and a second drop down entry that indicates a second representation of the auto-completion that corresponds to the universal search corpus and that excludes the icon representing the first corpus, wherein the universal search corpus includes two or more of a web search corpus, a places search corpus, a literature search corpus, a patent search corpus, an images search corpus, a videos search corpus, a news search corpus, a shopping search corpus, and a blogs search corpus. 7. The method of claim 6 , wherein: the one or more characters are received through a search box; and the first drop down entry that indicates the first representation of the auto-completion and that includes the icon representing the first corpus, and the second drop down entry that indicates the second representation of the auto-completion that corresponds to the universal search corpus are displayed in the drop down menu beneath the search box.