Idea of Timezone -12 Icon
A timezone -12 icon is represented with a foldout map icon and on the edge of the map there is a circle with a -12 written inside. The map will have straight lines on both sides, but on the top and bottom there will be a zig zag pattern to show it's foldout component.
This page contains the Timezone -12 vector icon, as well as variations of this icon in different visual styles, and related icons. All icons are in the flat vector style, however, differ by the line thickness, fill, and corner radius.