Adobe InDesign Icon, vectorized with Inkscape and optimised using Scour.
<a href="//commons.wikimedia.org/wiki/User:Amitie_10g" title="User:Amitie 10g">Davod</a>
Derivated from <a href="//commons.wikimedia.org/wiki/File:Adobe_Illustrator_Icon_(CS6).svg" title="File:Adobe Illustrator Icon (CS6).svg">File:Adobe_Illustrator_Icon_(CS6).svg</a>