This is a small ceramic capacitor with a capacitance of 2.3 pF and a tolerance of ±0.05 pF. It operates at a voltage rating of 25 volts and has the designation C0G/NP0, indicating it is part of the C0G (NP0) series, which is known for its stability over temperature changes. The metric size of this capacitor is 01005 (0402).