The Figure 0

nought - in general (British English)
zero - in general (American English)
  - in measurements of temperature (British and American English)
  - in count-downs (British and American English)
  - score in team games, e.g. football (American English)
oh - when each figure is said separately (e.g. in phone numbers, account numbers etc.)
nil - score in team games, e.g. football (British English)
love - in tennis and similar gamesderived from the French word l'oeuf (the egg) as the figure 0 is egg-shaped(i)