The octal numeration system is a number system that uses base-8 digits to represent numbers. There are several synonyms for this term, including octal system, octal notation, and base-8 system. The octal system is commonly used in computer programming and electronics, as it provides a convenient way to represent binary numbers in a more compact and easily readable format. Other number systems include decimal (base-10) and binary (base-2), among others. Despite its popularity in certain industries, the octal system is not widely used in everyday life, and most people are more familiar with the decimal system.