Board Thread:General Discussion/@comment-18172179-20171108030407/@comment-24253265-20171109090025

Some wikipedias have a Portal namespace (enwiki, dewiki, ...). Wikimedia has an institution custom namespace (also known as museum), some kind of special template for what the name says. They also have a custom namespace for video subtitles, and other custom namespaces. More than a decade ago used custom namespaces for help in different languages.