This ISO 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 4,600 icons, all in the same style and quality.
The logo is a rounded rectangle that is longer horizontally than it is vertically. On the inside of the rectangle are the letters "ISO" in all capital letters. The letters are centered on the inside off the rounded rectangle.