This is the {{Namespace detect}} meta-template. It helps other templates detect what type of page they are on.

It detects and groups all the different namespaces used on this wiki into several types:

main 

Main (i.e. article) space, where normal Roll20 articles are kept.

talk 

Any talk space, including page names that start with "Talk:", "User talk:", "File talk:", etc.

user • wikipedia • file • mediawiki • template • help • category • portal • book

The remaining namespaces.

other 

Any namespaces that were not specified as a parameter to the template.