The number "-23" is a negative integer that represents a value less than zero. In mathematics, negative numbers are used to indicate a deficit or a loss. For example, if you have 23 dollars in debt, you can express that amount as -23 dollars. In temperature measurements, "-23" can refer to degrees in the Celsius or Fahrenheit scale, indicating very cold conditions. For instance, a temperature of -23°C is significantly below freezing, which can affect weather patterns and the environment, impacting things like water and wildlife.