Health care specialists refer to the tetanus shot by an acronym rather than an abbreviation. Vaccines.gov lists the current abbreviation for the tetanus shot as "TT", which stands for tetanus toxoid.
Tetanus toxoids are sometimes combined with other vaccines rather than given to patients in a stand-alone vaccination, according to the Centers for Disease Control. The DT shot is a combination of tetanus and diphtheria toxoids that are commonly administered to pediatric patients, while the shot is referred to as Td when the same ingredients are given to adult patients in a single shot. Tetanus toxoids are also found in vaccination blends that are designed to prevent polio, pertussis and influenza.