The capacitor in question is the CAP CER 56PF 250V C0G/NP0 1812. It features a capacitance of 56 picofarads and an operating voltage of 250 volts. This ceramic capacitor falls under the designations of both C0G and NP0, which are equivalent specifications for a type of temperature-compensating capacitor known as NPO in the IEC and C80 in the EIA. In metric terms, it is referred to as the 4532 size.