Binary Coded Decimal

A number system where each decimal digit is separately represented by a 4-bit binary code;

for example

the decimal number 23 is represented as 0010 0011 (2 = 0010 and 3 = 0011, grouped together as shown), while in straight binary notation, 23 is represented as 10111.

See also: Binary Coded Digit, Offset Binary Coding, Signed Binary Coding.