Southern writes:  

A large-scale scan of the top million web sites (per Alexa traffic data) was performed in early 2010 using the Nmap Security Scanner and its scripting engine.

The area of each icon is proportional to the sum of the reach of all sites using that icon. When both a bare domain name and its "www." counterpart used the same icon, only one of them was counted. The smallest icons--those corresponding to sites with approximately 0.0001% reach--are scaled to 16x16 pixels. The largest icon (Google) is 11,936 x 11,936 pixels, and the whole diagram is 37,440 x 37,440. Since your web browser would choke on that, we have created the interactive viewer below (click and drag to pan, double-click to zoom, or type in a site name to go right to it).

Online lookup : The icon is at (2.327, 10.847) and is 48 × 48 pixels.
NMAP