Idea of Card Verification Value Icon
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.
This is a Card Verification Value icon. It is available in PNG and vector. Downloading is free for PNGs up to 100x100px.