O3
n.— «The distance is known in triathlon as the O3 race distance, or three times the Olympic distance that saw Triathlon debut as an Olympic sport in 2000 in Sydney.» —“Triathlon: Long Distance World Triathlon Championships Sunday in Canberra” RunnersWeb.com Nov. 16, 2006. (source: Double-Tongued Dictionary)
Further reading
Enthusiastic book recommendations! Martha’s savoring the biography of Alexander von Humboldt, the 19th-century explorer, polymath, and naturalist who revolutionized our understanding of nature and predicted the effects of human activity on...
Jim in Columbia, South Carolina, has noticed sportscasters’ use of the phrase on the season with reference to a period of time. This construction shows up in the sports pages as early as the 1880s, first referring to a team’s revenue and...