This wire is made of copper, which is a good conductor of electricity.
This indicates the cross-sectional area of the wire, which is 1.5 square millimeters. The cross-sectional area is a measure of the wire's thickness.
KEI is likely the brand or manufacturer of the wire. FR might refer to "Flame Retardant," meaning the wire is designed to resist catching fire and spreading flames.
This wire has a single central conductor. It's often used for simple electrical connections.