The Crossroads of the Aether
This is a brass, glass, paper, bakelite and steampunk icon that you could use for a link to anything you might use it for, that is up to you to decide. I use it as my link to my calculator in Windows. It might be useful for any mathematical function you have in mind.
This icon is eminently usable on windows/ Mac OS/X / Linux &c. Download http://rocketdock.com/addon/icons/43773