what does the term DHL-PPvC Booster mean

Here is what I found on a puppy care website. DHLPPVC: Often referred to as “Distemper vaccine” for simplicity. Includes Distemper, Hepatitis, Leptospirosis, Parainfluenza, Parvovirus, and Coronavirus. Annual boosters required starting the year after puppy series is completed. Here is the site it was on: http://www.westsidevets.com/puppy_care.html