100 to 1" typically refers to a ratio or a betting concept where the odds of an event happening are extremely low. It means that for every 100 instances where the event does not happen, it is expected to happen once. In a betting context, if you were to bet $1 on an outcome with 100 to 1 odds and it occurred, you would win $100 for every $1 wagered. It can also symbolize rarity or long odds in situations beyond betting, such as in business or sports.