WhatsApp and other 65,000 icons from Icons8 icon pack follow the visual guidelines of the operating systems: Windows, iOS, Android KitKat, and Material. PNG format is free up to 100x100 px. Icons are availble for download in PNG and vector (SVG, PDF, EPS, and more).
This is the logo for WhatsApp. The logo is an old school telephone with the earpiece at the top with a handle in the middle and the microphone in the bottom. The phone is place inside of an air bubble that resembles a thought bubble.
The Whatsapp is a popular app that has been around since 2009. The company was bought by Facebook not long after that. It is a great icon to use when you want to let people know chat is available, or that they can chat with you via this app.