Thought I'd update the 'distance' bit as, 11 years on, there's been some development.
Short course, which at a pro level is draft-legal, is raced at:
1) Standard (named as such because 'Olympic' is TM'd): 1.5km/40km/10km S/B/R
2) Sprint: half that (750m/20km/5km)
3) Super Sprint: half that again
Middle Distance, which is all draft illegal, but draft zone varies:
4) T100: 2km/80km/18km (draft zone 20m)
5) IRONMAN 70.3 (aka half Ironman): 1.9km/90km/21.1km (draft zone 12m)
Long Distance (aka 'full' or 'Ironman'):
6) Ironman: 3.8km/180km/42.2km (draft zone 12m)
7) Challenge (long, eg Roth): same
Our daughter is racing in New Zealand next Saturday (14 December 2024) in the 70.3 World Championships in Taupo:
Live broadcast (1745 UK Friday) if interested: Ironman Youtube (no sign in)