You may be looking for Help:Namespace.

There are some custom namespaces in use on Meta - namely, translated namespaces for Help: and Help talk: (into de, es, fr, ru...)

There should perhaps be a default page listing/describing custom namespaces on each wiki.

Help:Categories is in the Help: namespace

Meta's namespaces provide a basic structure for organising Meta content. This page, Meta:Namespaces, is in the Meta: namespace. Below is a complete list of the namespaces used at Meta and their functions.

Contents
  1. Standard namespaces
  2. Custom namespaces

Namespaces in numerical order

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Name &
synonyms
Lists of pages Nr. of pages
Special pages
Description
Standard Namespaces: Common to all MediaWiki Projects
Media
{{ns:-2}}
{{ns:media}}
n/a 1,965
MyUploads
Namespace for uploaded media files themselves, as opposed to description pages in the File namespace (6); for example [[Media:Krazy Kat Bugolist 1916 silent.ogv]] as compared to [[:File:Krazy Kat Bugolist 1916 silent.ogv]].
Special
{{ns:-1}}
{{ns:special}}
n/a SpecialPages The Special prefix is for pages that are automatically generated and cannot be edited. There is also no corresponding talk page, however, the parts that can be edited (i.e. system messages in the MediaWiki namespace) can be discussed on the appropriate talk page.
(Main)
{{ns:0}}
PrefixIndex 150,105
Uncategorized
Unwatched
Most Linked
Namespace 0 is here known as (Main). It is referred to as (Main) or Article namespace on other projects like Wikipedia. Unlike all other namespaces, this namespace has no prefix before the page name.
Talk
{{ns:1}}
{{ns:talk}}
PrefixIndex The Talk namespace is the discussion page for the (Main) namespace. Similar to other odd-numbered namespaces.
User
{{ns:2}}
{{ns:user}}
PrefixIndex
List Users
ActiveUsers
Administrators
MyPage
42,360,594
3,634
75
Registered users have a homepage User:Username linked to by the system in lists of edits, e.g. on page histories, and from signatures on talk pages. Users can edit their page and its subpages to present themselves or for project-related bookmarks, drafts, tests, and other working material. For users who do not log in, the same applies, with the IP as username.
User talk
{{ns:3}}
{{ns:user_talk}}
PrefixIndex MyTalk The User talk namespace is used for sending and receiving personal messages. You may send a message to another user by editing their user talk page just like you would edit any other page. If some one leaves you a message on your talk page, you will be notified when you log in.
Meta
{{ns:4}}
{{ns:project}}
(Alias: Project, M)
PrefixIndex The Meta namespace is an all-purpose namespace. It contains Meta's policies and guidelines, voting pages to grant users more power or inclusion into exclusive groups, complaints pages where users can request help in dealing with troublesome users, users essays concerning topics of interest, along with many project-related pages.
Use the name project instead of Meta on portable pages (especially templates), because project works on all MediaWiki installations.
Unsurprisingly there are also aliases M talk (shorter) and Project talk (portable) for Meta talk (namespace 5).
Meta talk
{{ns:5}}
{{ns:project_talk}}
PrefixIndex
File
{{ns:6}}
{{ns:file}}
(Alias: Image)
PrefixIndex
List Files
New Files
1,965
Uncategorized
Wanted
Most Linked
The File namespace is where all the images and media (such as audio and movie clips) are stored. On image pages, you will usually find the image as well as its copyright information, author, description, and much more.

You can also use Image talk for File talk (namespace 7).

File talk
{{ns:7}}
{{ns:file_talk}}
PrefixIndex
MediaWiki
{{ns:8}}
{{ns:mediawiki}}
PrefixIndex
AllMessages
The MediaWiki namespace is used to hold system messages and other important content. For instance, the page MediaWiki:Edit (or MediaWiki:Vector-view-edit in the default "Vector" skin) contains the text that fills the "Edit" tab at the top of every page. If that page exists, it overrides the default content, which is "edit this page". Similarly, MediaWiki:Common.css is the system message which holds the CSS code that is loaded for all users for each page. It has the special property that the entire namespace is fully protected and can only be edited by administrators.

To request changes, put {{edit request}} on the MediaWiki talk page. Note that "MediaWiki:" pages are often called through use of "int:" prefix. For example one can call {{MediaWiki:January}} (January) or {{int:January}} (January). The difference is that the latter will be translated to language of the user.

MediaWiki talk
{{ns:9}}
{{ns:mediawiki_talk}}
PrefixIndex
Template
{{ns:10}}
{{ns:template}}
PrefixIndex Uncategorized
Unused
Wanted
Most Linked
The Template namespace stores commonly used code for other namespaces. It is the default namespace for templates: the wikitext code {{name }} refers to and includes the page Template:name.
Template talk
{{ns:11}}
{{ns:template_talk}}
PrefixIndex
Help
{{ns:12}}
{{ns:help}}
PrefixIndex The Help namespace contains help pages for Meta. For an overview see Help:Contents
Help talk
{{ns:13}}
{{ns:help_talk}}
PrefixIndex
Category
{{ns:14}}
{{ns:category}}
PrefixIndex
Categories
Uncategorized
Unused
Wanted
Most Linked
The Category namespace is used to organize pages in other namespaces based on common themes, for example, in the Category:Proposals page you will find a list of all the pages (images, galleries, and subcategories) that contain the code [[Category:Proposals]].
Category talk
{{ns:15}}
{{ns:category_talk}}
PrefixIndex
Module Used for mw:Extension:Scribunto Lua modules.
Module talk
Gadget
Gadget talk
Gadget definition
Gadget definition talk
Custom Namespaces: Unique to Meta (plus associate talk namespaces)
Translations
{{ns:1198}}
{{ns:translations}}
PrefixIndex
Translations talk
CNBanner
CNBanner talk
Grants
{{ns:200}}
{{ns:grants}}
PrefixIndex
Grants talk
Research
{{ns:202}}
{{ns:research}}
PrefixIndex
Research talk
Schema
{{ns:470}}
{{ns:schema}}
PrefixIndex
Schema talk
Iberocoop
Iberocoop talk
Config
Config talk
Old namespaces (?)
Participation Used for another kind of grants.
Zero Similar to MediaWiki namespace, used for Wikipedia Zero configuration.

Former namespaces

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The following namespaces have been merged to the Help namespace, to use subpaged translation pages.

  • Hilfe:, Hilfe Diskussion
  • Aide:, Discussion Aide
  • hjælp:, Hjælp diskussion
  • Helpo:, Helpa diskuto
  • Hjälp:, Hjälp diskussion
  • Ayuda:, Ayuda Discusión
  • Aiuto:, Discussioni aiuto
  • ヘルプ:, ヘルプ‐ノート
  • NL Help:, Overleg help
  • Pomoc:, Dyskusja pomocy
  • Ajuda:, Ajuda Discussão
  • CA Ajuda:, CA Ajuda Discussió
  • Hjelp:, Hjelp diskusjon
  • 帮助:, 帮助 对话
  • Помощь:, Помощь Дискуссия
  • ,
  • ,