Idea of Hashtag Activity Feed Icon
It's a logo of three long very thin horizontal rectangles one on top of another, except the bottom one has its right end missing with blank space and on top of the space a hashtag sign.
This is the Hashtag Activity Feed icon for Windows 10
. Here we go. Optimized for 32x32 px, these are the simplest icons in the line style. Downloadable formats are PNG and SVG, among others. Icons8 icon pack is unique in providing a huge number of icons designed by the same team of four designers who create the new icons every working day in the same style and with the same quality. Same cool as the Bat Face, huh.