Alpha (SCAC) codes
The Standard Carrier Alpha Code (SCAC) is a unique two to four-letter code. NMFTA (National Motor Freight Traffic Association) developed SCAC identification codes in the mid 1960s to help road companies computerize data and records.
Though SCAC codes are common with LTL or Truckload shipping, they are used all over the transportation industry. SCAC codes are used in the automobile, petroleum, forestry, railroad, and ocean container industries, among many others. Like freight class, they are created and regulated by the NMFTA.