Babel boxes (OOC) tell readers about which languages you can read and speak. it has 7 levels from 0 to 5 aside with N (native)

(from: commons:File:Babel-extension-screenshot.png)

See:Wikipedia:Babel for more details.
It also categorizes users by language and level.

The wiki code to display the above image boxes is :

{{#babel:en|fr-3}}

Another example:

{{#babel:en-5|sv|no-4|he-3|lt-2|es-1|an-0}} 

Babel user information
en-5 This user has professional knowledge of English. sv-N Den här användaren har svenska som modersmål. no-4 Denne brukeren har kjennskap til norsk (bokmål) på nær morsmålsnivå. he-3 משתמש זה יודע עברית ברמה מתקדמת. lt-2 Šis naudotojas gali rašyti ir skaityti vidutinio lygio lietuvių kalba es-1 Este usuario tiene un conocimiento básico del español. an-0 Iste usuario no conoixe brenca l'aragonés (u lo entiende malament)
Users by language