From Ford Wiki

Similar templates on Wikimedia sister projects edit D:Template:void/doc N:Template:void/doc

This template does nothing.
More exactly, it outputs the null string. It's useful for programming advanced templates.

It often is used within a template to the right of an equals sign.

Alternatives

It's also possible to use {{ns:0}}, the empty/void/null string for the main M:Help:Namespace. Some M:Help:Magic words like __END__ might also have the desired effect of doing nothing.

See also

• Template:voidd (backlinks, edit) - can be used for monitoring parameter usage
• Voidi (backlinks, edit) - attempted alternative for voidd, does not seem to have the desired effect