BCD is an acronym that stands for Binary-Coded Decimal. It is a coding system that represents decimal numbers using binary digits. However, there are synonyms for BCD that can be used interchangeably. One of such synonyms is Excess-3 code. Also known as XS-3 code, it is a self-complementing code that adds three to the decimal number before coding it. Another synonym for BCD is 8-4-2-1 code. It represents decimal numbers using four bits, where each bit represents a power of two. Finally, Gray code is another synonym for BCD. It is a binary code that changes only one bit between adjacent values. These synonyms are often used in different industries, including computing, engineering, and electronics.