Fictitious entries, also known as fake entries, Mountweazels, ghost words and nihil articles, are deliberately incorrect entries or articles in reference works such as dictionaries, encyclopedias, maps, and directories. Entries in reference works normally originate from a reliable external source, but no such source exists for a fictitious entry. Copyright trap is a specific case where the motivation for the entry is to detect plagiarism or copyright infringement. The neologism Mountweazel was coined by the The New Yorker based on a fictitious biographical entry in the 1975 New Columbia Encyclopedia. Another term nihilartikel combines the Latin nihil (“nothing”) and German artikel (“article”).