This is a Timezone +5 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 12,700 icons, all in the same style and quality.
It is a combination of two overlayed objects. The background object is a generic map-like object that has zig-zag top and bottom edges and dots scattered on it. The foreground object is a circle in the lower-right of the map that has a large "+5" text in it.