Why BCD is called 8421 code?

Related questions

1. What extended ascii characters?
2. How many bits are ascii?
3. How many bits are in an Ascii character?
4. What is the Enter key in ascii?
5. How do you pronounce the ø?
6. What is the purpose of Ascii code?
7. What does 0x mean in hex?
8. What is LF in Ascii?
9. Do you put a line through a zero or an O?
10. What is the purpose of Ascii?

Tags

1. #column
2. #because
3. #given
4. #bcd8421
5. #according
6. #called
7. #weighting
8. #binary
9. #system
10. #value