The '3476' indicates a straight plug shell style. The 'L' specifies an Electroless Nickel finish for the connector body. The '10' denotes the shell size. The '-6' specifies the insert arrangement. The 'S' indicates socket (female) contacts. Identifies a Military Standard (MIL-DTL-26482 Series II) circular connector. Governed by the MS standard series, administered by Military Standards.