This is a small form factor ceramic capacitor with the designation CAP CER 20PF 200V C0G/NP0 0603. It has a capacitance value of 20 pF and operates at a maximum voltage rating of 200 volts. The C0G and NP0 classifications indicate that it is a type of ceramic material used in this capacitor, which provides stable and reliable performance over a wide range of temperatures.