An umbrella is an object used in Bad Piggies that speeds up the velocity in the direction it's facing.
Types
There is the black umbrella that when a player clicks the icon, in the way it is facing, will either make the vehicle go slower or regular speed. The yellow umbrella does a continuous flapping motion, propeled by a motor or the freckled pig, which can propell an object in the direction the tip is of the umbrella.
Appearance
The umbrella appears later in the game, and in the Sandbox bonus levels including Field of Dreams.