This is a 0805-sized, 8.2pF, 50V Multilayer Ceramic Capacitor (MLCC) manufactured by Prosperity and coded as FN21N8R2D500PAG. This MLCC is RoHS-compliant, meaning it is made without hazardous materials. It is a surface-mount device, meaning it is designed to be soldered directly to a circuit board. This type of capacitor is widely used for blocking, bypassing, filtering, and coupling of AC and DC signals, and is chosen for its high stability, low losses, and small form factor.