Normal numbers are defined as the ones which have an infinite string of decimal places and satisfy certain statistical properties. There are several synonyms for normal numbers that are used in mathematics. One of the commonly used synonyms is the term "typical number". This term is used to describe numbers that are representative of a given set of numbers. Another synonym for normal number is "standard number". A standard number is one that has a fixed value and is often used as a reference point for comparison. Finally, the term "ordinary number" is used to describe numbers that are usual or commonplace and do not have any special properties.