The Kahn Academy website icon is free to use
The website icon of the Kaplan Academy website is free.
The icon was included in the last update of the site, which is a paid service.
However, Kaplan Academy is not the only academic institution offering the free icon.
There are also several other academic institutions offering free icon, such as the Graduate School of Journalism at Dartmouth, which offers the free Icon, and the Graduate Institute of International and Development Studies at Yale University, which provides the free Logo.
However if you want to find a particular institution, such a free icon is probably not going to be as useful for you.
If you have any questions, or if you have a suggestion on how to make the free logo more useful, please feel free to drop me a line.