When searching on Special:Search, a suggestion is given to create a new page with the given search term if an exact match is not found.
e.g. 'Create the page "Berlin" on this wiki!'
It is possible to disable this via a hook it items are in the main namespace. On Wikidata (in some languages), the message is set to an empty message so nothing appears.
Whiteboard: u=dev c=frontend p=0 papercut