This Timezone +12 icon is made in Material Design style developed by Google. This style is based on extremely simplified shapes, thin two-pixel lines, and is optimized for 24x24 px. Unlike other vector icon packs that have merely hundreds of icons, this icon pack contains 5,300 icons, all in the same style and quality.
The icon is describing the users time zone. It is in the shape of a wavy paper thin wall with polka dots, and has a circle with the number +12 inside of it, located on the lower right section of the wavy paper thin wall.