The term “Knowledge Circle” used by Yahoo
The term “knowledge circle” is used by Yahoo to refer to a knowledge group of common interest.
http://help.cc.tw.yahoo.com/frame_sub_category.html?prodid=16&catyname=%E7%9F%A5%E8%AD%98%E5%9C%88&funclass=%E7%9F%A5%E8%AD%98%E5%9C%88&id=951
For example:
