It's a small rectangle with rounded edges. There is a black bar that crosses the entire rectangle a centimeter from the top edge. There is a smaller line underneath the bar that is set slightly in from the left hand side and ends at the middle of the rectangle.
This is a Credit Card 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 13,700 icons, all in the same style and quality.