Symbol library stores reusable objects - Symbols . The advantage of using symbols is that they do not add significantly to the size of a file because each symbol is merely a reference to a library object. You can easily make an object a symbol by dragging it into the Symbol palette and using a symbol is just as simple -- just drag it from the palette to the page. Master symbols may be edited at any time and changes are instantly applied to the child symbols in your illustration
File used by CineStyle Color Assist, a program used for applying CineStyle color profiles to Canon EOS DSLR cameras; formatted in XML and contains metadata describing a 3D color lookup table; helps boost the dynamic range of the camera to improve picture quality.