What Does Common Short Code (CSC) Mean?
A Common Short Code (CSC) is a short numeric code used to access certain mobile services via the transmission of special Short Message Service (SMS) messages. A CSC is usually three to six digits in length and designed for quick and easy mobile device entry.
Techopedia Explains Common Short Code (CSC)
A CSC may be obtained from the Common Short Code Administration (CSCA), Mobile Application Service Providers (MASP) and wireless carriers. A CSC application must be submitted to the appropriate wireless carrier for processing.