17. The system of claim 15 , wherein 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, 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 comprises: providing, for display in a first row of the drop down menu, the first drop down entry; and providing, for display in a second row of the drop down menu, the second drop down entry.
15. A system comprising: a data processing apparatus; and a data store storing instructions executable by the data processing apparatus that upon execution by the data processing apparatus cause the data processing apparatus to perform operations 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.