Idea of Diners Club Icon
There is a single rectangular shape that is longer then it is wider, and with slightly rounded edges. In the middle of this shape there is a circle, and in the middle of the circle there is a line going through it vertically. Behind the circle there is a darker circle emulating a shadow.
This Diners Club icon is made in Material Design style
developed by Google. This style is based on extremely simplified shapes, thin two-pixel lines, and is optimized for 24x24 px. Unlike other vector icon packs that have merely hundreds of icons, this icon pack contains 6,200 icons, all in the same style and quality.