This Swipe Down 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 4,700 icons, all in the same style and quality.
The "swipe down" symbol here consists of a circle, with a straight line extending down from its lower half in the middle, with two diagonal, upward-reaching lines extending upwards from the end of the line. It is a circle with a downward-pointing arrow extending from it.