The part number given is CAP CER 1.8PF 50V C0G/NP0 0603. This identifies a specific type of ceramic capacitor with the following characteristics: capacitance value of 1.8 picofarads, tolerance of ±0.1 picofarads, voltage rating of 50 volts, and a size designation of 0603 (or 1608 metric). The ceramic material used is C0G or NP0, which indicates it's a temperature-stable type with near-zero change in capacitance across a wide range of temperatures.