Idea of Wrong Pincode Icon
The logo shows two shapes indicating that you entered the wrong code. The shape on top is a long rectangle with four small circles in it, such as the diagram you see when you type in a PIN at an ATM. The shape below it is a circle with an X through it, denoting that it is incorrect.
This Wrong 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.