This is a Timezone +3 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.
A timezone +3 icon is represented with a foldout map icon. The map will have straight sides, but on the top and bottom will be a zig zag pattern. An important aspect of the timezone +3 icon is that there will be a +3 in a circle next to the map.