Idea of Hashtag Activity Feed Filled 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 a Hashtag Activity Feed Filled icon. We've made it in iOS style
, first introduced in iOS version 7 and supported in all later releases up until now (at least iOS 11). This style is based on thin two-pixel lines and is optimized for 50x50 px. Unlike other vector icon packs that have merely hundreds of icons, this icon pack contains 13,900 icons, all in the same style and quality.