The image is of a shape that has three sides. These three sides are all equal in lengths as well as angles. Noted that there are three angles; each angle connecting to one another to form this shape. These three angles are about sixty degrees each.
This is a Triangle 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.