Icon 093. Magnet
A magnet (from Greek μαγνήτις λίθος magnḗtis líthos, "Magnesian stone") is a material or object that produces a magnetic field. This magnetic field is invisible but is responsible for the most notable property of a magnet: a force that pulls on other ferromagnetic materials, such as iron, and attracts or repels other magnets.
This is another example of an icon missing from Symbolicons that is present in a number of other icon sets. (I know, they are a lot of these aren't there!?) I'm slowly working to correct the issue. Get in touch on Twitter if you've noticed any other glaring omissions!