because its so commmon and everyone knows wat it means
No.
CD in all caps is the correct abbreviation.
CD
CD
The abbreviation of carbon dioxide is CO2
CD stands for compact disc.
CD is an abbreviation of a noun phrase - compact disc or disk.
controlled drug
It doesnt play songs eaither.
At the link below.
CD is a masculine word in french: "un CD"
you are doomed!