» Octagonal is also an adjective of: Octagon Octagonal (foaled 1992 in New Zealand) is a retired champion Thoroughbred racehorse, affectionately called the big O or 'Occy'. He was sired by Zabeel, out of the broodmare Eight Carat, a descendant of Man o' War who was ranked No. 1 on the Blood-Horse magazine List of the Top 100 U.S. Racehorses of the 20th Century. Trained by John Hawkes, in 1995 Octagonal was crowned the Australian Champion Two Year Old. The two-year-old Octagonal won the AJC Sire… (More on Octagonal)