The icon is of an inbox, like where you would put mail or papers on a desk. It is a rectangle box without a lid. On the front at the top there is a semi-circle cutout. It is facing forward.
This is a Inbox 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 13,300 icons, all in the same style and quality.