CD

• the symbol for the chemical element cadmium (Cd)
• the abbreviated form of the SI unit of light intensity, candela
• an initialism for Cash dispenser (at least used in Japan)
• a Unix command, see cd (DOS / Unix Command)
• an abbreviated version of the MS-DOS command chdir - see Cd (DOS / Unix Command)
• an initialism for Certificate of deposit
• an initialism for Ceske Drahy -- Czech Railways
• a designation of a 1960s Panhard race car designed by Charles Deutsch
• an abbreviation of Civil defense
• an abbreviation for cluster of differentiation, (e.g. CD4 or CD8 lymphocytes).
• an initialism for Compact disc; it can also refer to an Enhanced CD.
• an abbreviation of Corps Diplomatique
• the ISO country code for the Democratic Republic of the Congo
• the Internet top-level domain for the Democratic Republic of the Congo, see .cd
• an abbreviation for Circular dichroism