U-9

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U-9

Quality:

German submarine U-9 - 1935 Type IIB submarine. Article “U-9” in Portuguese Wikipedia has 20.8 points for quality (as of July 1, 2025). The article contains 8 references and 5 sections.

This article has the best quality in Chinese Wikipedia. However, the most popular language version of this article is English.

Since the creation of article “U-9”, its content was written by 6 registered users of Portuguese Wikipedia and edited by 296 registered Wikipedia users in all languages.

The article is cited 19 times in Portuguese Wikipedia and cited 2075 times in all languages.

The highest Authors Interest rank from 2001:

  • Local (Portuguese): #15439 in January 2016
  • Global: #36350 in August 2009

The highest popularity rank from 2008:

  • Local (Portuguese): #246896 in September 2014
  • Global: #408019 in March 2009

There are 17 language versions for this article in the WikiRank database (of the considered 55 Wikipedia language editions).

The quality and popularity assessment was based on Wikipédia dumps from July 1, 2025 (including revision history and pageviews for previous years).

The table below shows the language versions of the article with the highest quality.

Languages with the highest quality

#LanguageQuality gradeQuality score
1Chinese (zh)
U-9号潜艇 (1935年)
67.7541
2Polish (pl)
U-9 (1935)
66.2421
3Russian (ru)
U-9 (1935)
41.7601
4German (de)
U 9 (U-Boot, 1935)
33.4833
5Hungarian (hu)
U–9 (második világháborús tengeralattjáró)
33.0131
6Dutch (nl)
U 9 (Kriegsmarine)
29.7852
7Vietnamese (vi)
U-9 (tàu ngầm Đức) (1935)
28.8231
8English (en)
German submarine U-9 (1935)
26
9Portuguese (pt)
U-9
20.8241
10Spanish (es)
U 9 (1935)
12.4196
More...

The following table shows the most popular language versions of the article.

Most popular in all the time

The most popular language versions of the article "U-9" in all the time
#LanguagePopularity awardRelative popularity
1English (en)
German submarine U-9 (1935)
81 884
2German (de)
U 9 (U-Boot, 1935)
69 186
3Russian (ru)
U-9 (1935)
40 971
4Polish (pl)
U-9 (1935)
21 268
5Spanish (es)
U 9 (1935)
10 467
6French (fr)
Unterseeboot 9 (1935)
8 345
7Romanian (ro)
Unterseeboot 9 (1935)
6 955
8Portuguese (pt)
U-9
4 955
9Chinese (zh)
U-9号潜艇 (1935年)
3 931
10Dutch (nl)
U 9 (Kriegsmarine)
3 664
More...

The following table shows the language versions of the article with the highest popularity in the last month.

Most popular in June 2025

The most popular language versions of the article "U-9" in June 2025
#LanguagePopularity awardRelative popularity
1English (en)
German submarine U-9 (1935)
293
2German (de)
U 9 (U-Boot, 1935)
212
3Russian (ru)
U-9 (1935)
187
4Chinese (zh)
U-9号潜艇 (1935年)
79
5Polish (pl)
U-9 (1935)
46
6Serbian (sr)
Немачка подморница У-9
45
7French (fr)
Unterseeboot 9 (1935)
33
8Portuguese (pt)
U-9
24
9Dutch (nl)
U 9 (Kriegsmarine)
22
10Spanish (es)
U 9 (1935)
16
More...

The following table shows the language versions of the article with the highest Authors’ Interest.

The highest AI

Language versions of the article "U-9" with the highest Authors Interest (number of authors). Only registered Wikipedia users were taken into account.
#LanguageAI awardRelative AI
1German (de)
U 9 (U-Boot, 1935)
89
2English (en)
German submarine U-9 (1935)
51
3French (fr)
Unterseeboot 9 (1935)
29
4Polish (pl)
U-9 (1935)
25
5Russian (ru)
U-9 (1935)
25
6Ukrainian (uk)
U-9 (1935)
11
7Persian (fa)
او-۹ (کریگس‌مارینه)
9
8Dutch (nl)
U 9 (Kriegsmarine)
9
9Serbian (sr)
Немачка подморница У-9
9
10Spanish (es)
U 9 (1935)
8
More...

The following table shows the language versions of the article with the highest Authors’ Interest in the last month.

The highest AI in June 2025

Language versions of the article "U-9" with the highest AI in June 2025
#LanguageAI awardRelative AI
1English (en)
German submarine U-9 (1935)
1
2French (fr)
Unterseeboot 9 (1935)
1
3Arabic (ar)
الغواصة الألمانية يو-9 (1935)
0
4German (de)
U 9 (U-Boot, 1935)
0
5Spanish (es)
U 9 (1935)
0
6Persian (fa)
او-۹ (کریگس‌مارینه)
0
7Hungarian (hu)
U–9 (második világháborús tengeralattjáró)
0
8Dutch (nl)
U 9 (Kriegsmarine)
0
9Polish (pl)
U-9 (1935)
0
10Portuguese (pt)
U-9
0
More...

The following table shows the language versions of the article with the highest number of citations.

The highest CI

Language versions of the article "U-9" with the highest Citation Index (CI)
#LanguageCI awardRelative CI
1Arabic (ar)
الغواصة الألمانية يو-9 (1935)
1 151
2German (de)
U 9 (U-Boot, 1935)
265
3English (en)
German submarine U-9 (1935)
198
4Ukrainian (uk)
U-9 (1935)
79
5French (fr)
Unterseeboot 9 (1935)
67
6Russian (ru)
U-9 (1935)
67
7Polish (pl)
U-9 (1935)
60
8Chinese (zh)
U-9号潜艇 (1935年)
56
9Vietnamese (vi)
U-9 (tàu ngầm Đức) (1935)
52
10Slovenian (sl)
U-9 (Kriegsmarine)
30
More...

Scores

Estimated value for Wikipedia:
Portuguese:
Global:
Popularity in June 2025:
Portuguese:
Global:
Popularity in all years:
Portuguese:
Global:
Authors in June 2025:
Portuguese:
Global:
Registered authors in all years:
Portuguese:
Global:
Citations:
Portuguese:
Global:

Quality measures

Interwikis

#LanguageValue
arArabic
الغواصة الألمانية يو-9 (1935)
deGerman
U 9 (U-Boot, 1935)
enEnglish
German submarine U-9 (1935)
esSpanish
U 9 (1935)
faPersian
او-۹ (کریگس‌مارینه)
frFrench
Unterseeboot 9 (1935)
huHungarian
U–9 (második világháborús tengeralattjáró)
nlDutch
U 9 (Kriegsmarine)
plPolish
U-9 (1935)
ptPortuguese
U-9
roRomanian
Unterseeboot 9 (1935)
ruRussian
U-9 (1935)
slSlovenian
U-9 (Kriegsmarine)
srSerbian
Немачка подморница У-9
ukUkrainian
U-9 (1935)
viVietnamese
U-9 (tàu ngầm Đức) (1935)
zhChinese
U-9号潜艇 (1935年)

Popularity rank trends

Best Rank Portuguese:
#246896
09.2014 		Global:
#408019
03.2009

AI rank trends

Best Rank Portuguese:
#15439
01.2016 		Global:
#36350
08.2009

Languages comparison

Important global interconnections (July 2024 – June 2025)

Wikipedia readers most often find their way to information on German submarine U-9 from Wikipedia articles about Type II submarine, List of U-boat types, List of U-boats of Germany, 30th U-boat Flotilla and Iron Cross. Whereas reading the article about German submarine U-9 people most often go to Wikipedia articles on Type II submarine, Doris, U-10, Wolfgang Lüth and List of shipwrecks in May 1944.

Cumulative results of quality and popularity of the Wikipedia article

List of Wikipedia articles in different languages (starting with the most popular):

en: German submarine U-9 (1935)
de: U 9 (U-Boot, 1935)
ru: U-9 (1935)
pl: U-9 (1935)
es: U 9 (1935)
fr: Unterseeboot 9 (1935)
ro: Unterseeboot 9 (1935)
pt: U-9
zh: U-9号潜艇 (1935年)
nl: U 9 (Kriegsmarine)
sr: Немачка подморница У-9
sl: U-9 (Kriegsmarine)
uk: U-9 (1935)
hu: U–9 (második világháborús tengeralattjáró)
fa: او-۹ (کریگس‌مارینه)
ar: الغواصة الألمانية يو-9 (1935)
vi: U-9 (tàu ngầm Đức) (1935)

News from 15 February 2026

On 15 February 2026 in multilingual Wikipedia, Internet users most often read articles on the following topics: Jeffrey Epstein, Wuthering Heights, 2026 Winter Olympics, Epstein files, Ilia Malinin, Wuthering Heights, Ghislaine Maxwell, Lucas Pinheiro Braathen, 2026 Winter Olympics medal table, Valentine's Day.

In Portuguese Wikipedia the most popular articles on that day were: Lucas Pinheiro Braathen, Jeffrey Epstein, Isadora Cruz, Shawn Mendes, Maria Quitéria, Arquivos de Epstein, Dia dos Namorados, Léa Garcia, Margaret Thatcher, Trace Brasil.

About WikiRank

The WikiRank project is intended for automatic relative evaluation of the articles in the various language versions of Wikipedia. At the moment the service allows to compare over 44 million Wikipedia articles in 55 languages. Quality scores of articles are based on Wikipedia dumps from July, 2025. When calculating current popularity and AI of articles data from June 2025 was taken into account. For historical values of popularity and AI WikiRank used data from 2001 to 2025... More information