The okay hand gesture, also known as the A-Okay sign, is a common gesture that is used to indicate approval, agreement, or understanding. It is made by forming a circle with the thumb and index finger and extending the other three fingers. The okay hand gesture is a popular gesture in many cultures around the world, and it is often used in communication and social media. Green nails are a popular fashion trend, and they can also be used to symbolize support for environmental causes or other social movements. An Okay with Green Nails Sticker.