| C/N | Carbon to Nitrogen ratio 
| Others |
| C/N | Clutter-to-Noise
| Others |
| C/N | Counternarcotics
| Others |
| CN | C.N. Tower
| Others |
| CN | Caccia Notturna
| Others |
| CN | cademia Ancient
| Others |
| CN | Calling Number
| Others |
| CN | Can
| Others |
| CN | Can anyone
| Others |
| CN | Canada Needle
| Others |
| CN | Canada's Neatest
| Others |
| CN | Canadian National
| Others |
| CN | Canadian National Railway Company
| Others |
| CN | Canadian National, railroad
| Others |
| CN | Canon Note
| Others |
| CN | Capital Nature
| Others |
| CN | Carbon:Nitrogen
| Others |
| CN | Care Net
| Others |
| CN | Caribbean Netherlands
| Others |
| CN | Carpe Noctem
| Others |
| CN | Carton
| Others |
| CN | Cartoon Network
| Others |
| CN | Cell Number
| Others |
| CN | Cellulose Nitrate
| Others |
| CN | Central Nexus
| Others |
| CN | Central Nucleus
| Others |
| CN | Centrilobular Necrosis
| Others |
| CN | Certified Naprapath
| Others |
| CN | Change Notice
| Others |
| CN | Chaotic Neutral
| Others |
| CN | Charge Nurse
| Others |
| CN | Charle November
| Others |
| CN | chemonucleosis
| Others |
| CN | Child Nutrition
| Others |
| CN | China
| Others |
| CN | Chiral Nematic
| Others |
| CN | Choctaw Nation
| Others |
| CN | Chronic Nephritis
| Others |
| CN | Chuck Norris
| Others |
| CN | Cincinnati Northern Railroad
| Others |
| CN | Circuit Net
| Others |
| CN | Circular Notes
| Others |
| CN | Class Notes
| Others |
| CN | Clinical Nursing
| Others |
| CN | Clinical Nutrition
| Others |
| CN | Coagulation Necrosis
| Others |
| CN | Coated Nylon
| Others |
| CN | Cochlear Nucleus
| Others |
| CN | Code Name
| Others |
| CN | Code nbsp
| Others |
| CN | Cognitively Normal
| Others |
| CN | Colloid Nodules
| Others |
| CN | Color Negative
| Others |
| CN | Colts Neck
| Others |
| CN | Combined Nomenclature
| Others |
| CN | Command Network
| Others |
| CN | Commemorative Nagel
| Others |
| CN | Common Name
| Others |
| CN | Common Noun
| Others |
| CN | Communist Nation
| Others |
| CN | Community Nurse
| Others |
| CN | Company Number
| Others |
| CN | Comparably Neolithic
| Others |
| CN | Composition Number
| Others |
| CN | Computer Networks
| Others |
| CN | Computer Number
| Others |
| CN | Concealed Normal
| Others |
| CN | Condensation Nuclei
| Others |
| CN | Condensation Nucleus
| Others |
| CN | Conditional Narrowing
| Others |
| CN | Congeital Nevus
| Others |
| CN | Congenital Neutropaenia
| Others |
| CN | Congenital Nystagmus
| Others |
| CN | Consignes de Navigabilite
| Others |
| CN | Construction Number
| Others |
| CN | Constructionman
| Others |
| CN | Container Name
| Others |
| CN | Content Notation
| Others |
| CN | Context Node
| Others |
| CN | Contrast Nephropathy
| Others |
| CN | Control Number
| Others |
| CN | Control The Name
| Others |
| CN | Coordination Number
| Others |
| CN | Coordination Numbers
| Others |
| CN | Copernicium
| Element |
| CN | Copper Nickel
| Others |
| CN | Copper Nickel coin
| Others |
| CN | Copy Number
| Others |
| CN | Core Network
| Others |
| CN | Core Node
| Others |
| CN | Corning
| Others |
| CN | Corporation Network
| Others |
| CN | Cortical Necrosis
| Others |
| CN | Cotton/Nylon
| Others |
| CN | Countable Noun
| Others |
| CN | Counter-Narcotic
| Others |
| CN | County Cavan
| Others |
| CN | Course Notes
| Others |
| CN | Coveting Nightshade
| Others |
| CN | Cracked Nut
| Others |
| CN | Cranial Nerve
| Others |
| CN | cranial nerve(s)
| Others |
| CN | Credit Note
| Others |
| CN | Cremaster Nucleus
| Others |
| CN | Crigler-Najjar
| Others |
| CN | Criminal Non-Traffic
| Others |
| CN | Croco Noir
| Others |
| CN | Cultura Nacional
| Others |
| CN | CumuloNimbus
| Others |
| CN | Cuneate Nucleus
| Others |
| CN | Cuneo (Provence)
| Others |
| CN | Currency Neutral
| Others |
| CN | Cursed Name
| Others |
| CN | Customers Name
| Others |
| CN | Cut Nail
| Others |
| CN | Cyanide
| Others |
| CN | Cyber Nations
| Others |
| CN | Cyclic Neutropenia
| Others |
| CN | Cyclic Nucleotide
| Others |
| CN | Cylindrical Nanoparticle
| Others |
| CN | Cystic Nephroma
| Others |
| CN | International Workshop on Community Networking
| Others |
| Cn. | Cinders
| Others |