Idea of Good Pincode Icon
There is a retangled that is shorter than it is wide with four dots equally spaced in the the center of it. Below the rectangle is a circle that is about half the size of a the rectangle centered. Inside the circle is a check mark.
This Good Pincode 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 6,200 icons, all in the same style and quality.