This is the Kod bezpieczeństwa karty icon for Windows 10. Here we go. Optimized for 32x32 px, these are the simplest icons in the line style. Downloadable formats are PNG and SVG, among others. Icons8 icon pack is unique in providing a huge number of icons designed by the same team of four designers who create the new icons every working day in the same style and with the same quality. Same cool as the Bat Face, huh.
This icon is showing a blank card with part of it enlarged to show detail. The card is a rectangle with curved edges, and inside the rectangle is a thick, black bar extending horizontally from one end to the other. Circled and enlarged to show detail are the letters CSC which stands for Card Security Code.