This icon is a part of a collection of Stoper flat icons produced by Icons8. Icons follow the guidelines of iOS, Windows, and Android and are designed by a single designer, guaranteeing the consistent quality. Both PNG and vector are available.
A stopwatch is something that ticks and is handheld. It is circular with a little timer in the right so that you can click it and start + stop time. It has hands that keep track of how many seconds it has been.