Hexadecimal

Hexadecimal is a numeral system with base 16, using digits A through F.
It is commonly used in computer systems for representing binary data.
Hexadecimal can express negative numbers and exact bit patterns used in processors.
Hexadecimal exponential notation allows for the representation of decimal numbers in hexadecimal.
Binary conversion is easier with hexadecimal than decimal, especially for large numbers.
Other simple conversions include quaternary and octal systems.
The hexadecimal system can represent rational numbers, but repeating expansions are common.
Hexadecimal (and binary) are less convenient than decimal for representing rational numbers due to the presence of recurring digits.
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Шестнадцатеричный — Википедия