This is a Код проверки CVV icon. We've made it in iOS style, first introduced in iOS version 7 and supported in all later releases up until now (at least iOS 11). This style is based on thin two-pixel lines and is optimized for 50x50 px. Unlike other vector icon packs that have merely hundreds of icons, this icon pack contains 12,900 icons, all in the same style and quality.
The icon is shaped like a rectangle with curved corners and towards the top is a shaded rectangular strip that runs left to right. There is a circle at the center of the rectangle with the letters CVV in it with horizontal lines at the top and bottom of the letters. The circle overlaps the rectangle a bit and sticks out slightly at the bottom.