Wikipedia 15 celebrates the fifteenth birthday of the birth of Wikipedia, a project which exists today in almost 300 languages and which contains more than 36 million articles. This page covers the style used during the celebration, as well as the icons and images used throughout.
The icons were developed by Mule Design and released under a CC-0 licence to allow for as wide a usage as possible. Initially, the collection comprised 31 individual "marks", though communities were encouraged to develop their own with a simplified set of guidelines to follow.
The full set of icons is available on Commons, at Category:Wikipedia 15 marks.
These icons were often paired with the Wikipedia 15 wordmark, in various languages. These can be found in the index, Category:Wikipedia 15 marks by language.
Various color variants were developed of the icons for use in other situations (such as the banners). See Category:Color variants of Wikipedia 15 marks.
"Wikipedia" is written in Open Sans Condensed Light, while "15" is written in Open Sans Bold. Should a non-Roman character set be used, a typeface in sans-serif is preferred where possible.