This icon represents party hat. It is a triangle with a small round circle at the top of it with four wavy lines going down the hat from side to side.
This Party Hat 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 5,700 icons, all in the same style and quality.