In the Babylonian numeral system, a blank space was used to represent zero. This was the first known use of a symbol to represent zero.

Aryabhata, an Indian mathematician and astronomer, is credited with developing the concept of zero as a number in its own right in the 5th century AD.

Aryabhata introduced the concept of zero in his treatise called Aryabhatiya.

Brahmagupta extended Aryabhata's work on zero and developed a system of notation for representing numbers using zero.

Brahmagupta developed a system of notation for representing numbers using zero called Brahmi numerals.

The decimal system was first used in the 1st century BC by the Chinese mathematician and astronomer Liu Xin.

Gerbert of Aurillac introduced the decimal system to the Western world in the 10th century AD.

Leonardo of Pisa popularized the decimal system in Europe through his book Liber Abaci.

The decimal system became widely adopted throughout the world in the 19th century.

The decimal system is easy to learn and use, it is a base-10 system which makes it easy to perform calculations, and it is a universal system which means it is used by people all over the world.

The decimal system is used in currency, measurement, science, and many other applications.

The decimal system is not always accurate, it can be difficult to perform certain calculations, and it is not always easy to convert between different units of measurement.

There are a number of alternatives to the decimal system, including the binary system, the hexadecimal system, and the octal system.

The binary system is a system that uses two symbols, 0 and 1.

The hexadecimal system is a system that uses sixteen symbols, 0-9 and A-F.

The octal system is a system that uses eight symbols, 0-7.