This is a Timezone -2 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 13,000 icons, all in the same style and quality.
It is a combination of two objects. One is a generic folded map-like object with a zig-zag top and bottom that is partially covered in dots. In the foreground is a circle with the number "-2" in the center.