- The "Total" column refers to the number of pages in all namespaces, including both articles (the official article count of each wiki) and non-articles (user pages, images, talk pages, "project" pages, categories, and templates).
- "Active users" are registered users who have made at least one edit in the last thirty days.
- "Images" is the number of locally uploaded files. Note that some large Wikipedias don't use local images and rely on Commons completely, so the value 0 is not a glitch.
- The "Depth" column (Edits/Articles × Non-Articles/Articles × [1−Stub-ratio]) is a rough indicator of a Wikipedia’s quality, showing how frequently its articles are updated. It does not refer to academic quality.
- Lsjbot, a bot run by Sverker Johansson, is responsible for much of the growth of the second and third largest Wikipedias, the Cebuano and the Swedish Wikipedias, respectively, as well as the rapid growth of the Waray Wikipedia.
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Each Wikipedia has a code, which is used as a subdomain below wikipedia.org. Interlanguage links are sorted by that code. The codes represent the language codes defined by ISO 639-1 and ISO 639-3, and the decision of which language code to use is usually determined by the IETF language tag policy. Wikipedias also vary by how thinly they slice dialects and variants; for example, the English Wikipedia includes most modern varieties of English (American English, British English, Indian English, South African English, etc.), but does not include other related languages such as Scots, or Anglo-Saxon, all of which have separate Wikipedias. The Spanish Wikipedia includes both Peninsular Castilian and Latin American Spanish; Malay Wikipedia includes a large number of Malay languages; and so on.
Differences between the ISO mappings and Wikipedia codes include:
|WP code||WP edition name||ISO 639 code for this language||Notes|
|sq||Albanian||'sq' is the ISO code for the Albanian macrolanguage, which includes four individual languages.|
|als||Alemannic||'gsw' for Swiss German, Alemannic German, and Alsatian; 'gct' for Colonia Tovar dialect; 'swg' for Swabian German, and 'wae' for Walser German||'als' is actually the ISO code for Tosk Albanian.|
|roa-rup||Aromanian||rup||'roa' is the ISO code for Romance (Other).|
|map-bms||Banyumasan||'map' is the ISO code for Austronesian (Other).|
|nds-nl||Dutch Low Saxon||The Low Saxon dialects in the Netherlands have their own ISO codes.||In ISO, nds is 'Low Saxon', restricted to Germany in Ethnologue.|
|bh||Bihari||ISO collective code 'bih' is a macrolanguage which includes Bhojpuri (bho), Maithili (mai), Magahi (mag) and nine others.||Bihari Wikipedia excludes Maithili (mai) and Fiji Hindi (hif) which exist as independent Wikipedias.|
|ms||Malay||ISO collective code 'ms' is a macrolanguage that includes more than 30 individual languages and dialects. However, the wiki excludes Indonesian because Indonesian Wikipedia (id) exists independently.|
|no||Norwegian Bokmål||nb, nob||ISO uses no for Norwegian in general. (Norwegian Nynorsk is at 'nn' in both ISO and Wikipedia.)|
|ksh||Ripuarian||none||ISO ksh is for the Kölsch language, the most prominent dialect of the Ripuarian language group. The other variants (e.g. the Aachen dialect) do not have ISO codes.|
|bat-smg||Samogitian||sgs||'bat' is the ISO code for Baltic (Other).|
|roa-tara||Tarantino||none||'roa' is the ISO code for Romance (Other).|
|cbk-zam||Zamboanga Chavacano||none||ISO cbk is for the Chavacano language. The individual variants do not have ISO codes.|
Additionally, Wikipedias vary in wikt:orthography at times. Chinese Wikipedia automatically translates from modern Mandarin Chinese into five standard forms: Mainland China and Singapore in simplified Chinese characters, and Taiwan, Hong Kong and Macau in traditional Chinese characters. Belarusian, however, has a separate Wikipedia for the 'normative' orthography (be) and Taraškievica (be-tarask).
An approximation of the number of active users (registered users who have made at least one edit in the last thirty days) is given in powers of ten (see common logarithm): so "5" means at least 100,000 (105), "4" means at least 10,000 (104), "3" means at least 1000 (10³), and so on.
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