This icon is a part of a collection of Karty bankowe flat icons produced by Icons8. Icons follow the guidelines of iOS, Windows, and Android and are designed by a single designer, guaranteeing the consistent quality. Both PNG and vector are available.
These are physical cards, laminated rectangle cards with bar codes running down the back that can be scanned. It's essentially a rectangle with smoothed edges, on it is your name and card number that helps utilizing it. They come with your name written on them and are great for using online or anywhere else.