This is an image of a square. Inside of the square is a line which looks like a heart rate monitor chart. There are four peaks on this line and they are all of varying sizes.
This ECG 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.