This refers to the Girls' Love (GL) genre of Japanese media. You may be looking for a retrospective on the best titles released in 2012 (such as YuruYuri♪♪ ) or the state of the genre during that year.
When the Mayan calendar failed to end the world in December 2012, the Yuri fandom breathed a sigh of relief. The world continued. And so did the stories. 2012 yuri
: Improving the performance of Boolean satisfiability solvers through automated configuration. 2. Agricultural Science & Apple Physiology (J.A. Yuri) This refers to the Girls' Love (GL) genre of Japanese media