The icon is a picture of an insert table. It is a rectangle with 6 smaller rectangles inside of it. All of the lines run exact and perpendicular. Together there's more than 7 rectangles in this picture.
This is a Table 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 13,700 icons, all in the same style and quality.