Hexadecimal Number
Hexadecimal is a base- (also base-) numeral system that uses 16 distinct symbols to represent values: the digits 0-9 and the letters A-F to represent 10-15 in decimal. Hexadecimal numbers are often prefixed with 0x to distinguish them. In computer science, they are used as a more compact way to store bits in clusters of 2 bytes (or 8 bits).