"The biga (Latin, plural bigae) is the two-horse chariot as used in ancient Rome for sport, transportation, and ceremonies. Other animals may replace horses in art ...
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and occasionally for actual ceremonies. The term biga is also used by modern scholars for the similar chariots of other Indo-European cultures, particularly the two-horse chariot of the ancient Greeks and Celts. The driver of a biga is a bigarius.
Other Latin words that distinguish chariots by the number of animals yoked as a team are quadriga, a four-horse chariot used for racing and associated with the Roman triumph; triga, or three-horse chariot, probably driven for ceremonies more often than racing (see Trigarium); and seiugis or seiuga, the six-horse chariot, more rarely raced and requiring a high degree of skill from the driver. The biga and quadriga are the most common types." - (en.wikipedia.org 10.09.2020)