This icon looks to be an unfinished square. Instead of having the top sides connect, there is a gap that has two arrows with curved tails going into it. The arrows are pointing down.
This Feed In 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 16,000 icons, all in the same style and quality.