This is a CAP CER 18PF 50V C0G/NP0 type ceramic capacitor. It has a capacitance of 18 picofarads and operates at a voltage rating of ±50 volts. The C0G designation indicates that it is part of the C0G or NP0 (NPO) class, which is known for its stability and temperature characteristics. This component comes in an 0805 package size, equivalent to a metric 2012 size.