A normal integral is a type of integration performed on a probability density function that follows a normal distribution. There are several synonyms for a normal integral, including Gaussian integral, bell curve integral, and probability density function integral. These terms are used interchangeably and refer to the same mathematical concept. The normal integral is a crucial tool in statistics and probability theory, as it helps to calculate the probability of a random variable falling within a specified range. Understanding the synonyms for normal integral is essential for anyone working in the fields of statistics, economics, and finance.