Biathlon is a combination of two sporting events: cross-country skiing, and rifle shooting. However, there are other synonyms for the term "biathlon" that refer to similar events. One such term is the "pentathlon," which features five events: shooting, fencing, swimming, equestrian, and running. Another is the "triathlon," which involves swimming, cycling, and running. The "modern pentathlon," an Olympic event, includes fencing, swimming, horseback riding, shooting, and running. Additionally, there's the "duathlon," an event that combines cycling and running, and the "aquathlon," which consists of swimming and running. However, none of these events have quite the same combination of sports as the biathlon, which makes it a unique and highly specialized sporting event.