Idea of Party Balloon Icon
The image is of an round shape that isn't a perfect circle. The top is more circular and comes to a bit of a rounded point at the bottom. The top is wider than the bottom. From the bottom of the object is a squiggly line.
This page contains the Party Balloon 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.