It's a drawing of a sad face. The face has a frowning mouth and eyes slanted down to from the center to the outside to indicate sadness. the outline of the face looks like the basic shape of an acorn.
This is a Drama 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.