There is a rectangle, with a wavy line in it - this is to show a cake and frosting on it. There are three candles on top of the cake evenly spread out. They each have a flame on top of them.
This is a Birthday icon. We've made it in iOS style
, first introduced in iOS version 7 and supported in all later releases up until now (at least iOS 11). This style is based on thin two-pixel lines and is optimized for 50x50 px. Unlike other vector icon packs that have merely hundreds of icons, this icon pack contains 13,700 icons, all in the same style and quality.