Is there a term for the operation $A B A^T$? In colloquial terms, I might call this a "sandwich" of a matrix between another matrix and the transpose of that other matrix.
How about for the special case where $B$ (as well as $A B A^T$) is symmetric? This shows up often in Kalman filtering.
I would like to look up some properties of this kind of operation but I'm not sure what to search for.