This is a Historical 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 12,300 icons, all in the same style and quality.
This is a picture of an hourglass. It has more sand in the bottom than the top, and it's top and bottom parts are squarely shaped, almost like a crown moulding. It is symmetrical besides the amount of sand.
Related to Historical Icon
Related icons are the icons with matching tags, as well as all cinema icons. All icons are in the same flat style. You can either download free PNG icons or buy SVG vectors