It looks like the outline of a computer chip of some sort. It is mostly square, but on the left corner it's straight. There are then lines going around the inside that meet at a smaller square in the middle.
This RFID Tag icon is a responsive icon. This means that it's optimized for four resolutions, from tiny 16x16 until highly detailed 80x80. The style comes from the latest Microsoft Office
, which makes it perfect for any Windows applications, in particular, those with ribbon toolbar control. Unlike other icon packs that have merely hundreds of icons, this monster icon pack contains 15,800 icons, all in the same style and quality.