This page lists single unused keys in Vim. As such, it is an inverted version of :help index. In addition, the page lists synonyms that can safely be mapped. Many more mappings are possible by combining keys. See the article "Follow my leader" in § External links below for hints on combining keys. In the following table, the type "Free" means a key is not used in Vim by default, whereas the type "Synonym" means a key is used in Vim by default but is a synonym for some other key that is also used