| English | Thesaurus |
| c.c.e.i. | composite cost effectiveness index |
| C&I | commerce and industry |
| C/I | carrier /interference ratio |
| c.i.f.& i. | cost, insurance, freight, commission and interest |
| c.i.f.c.fr e. | cost, insurance, freight, commission and exchange |
| c.i.f.c.fr i. | cost, insurance, freight, commission and interest |
| c.i.f.c.i. | cost, insurance and freight plus commission and interest |
| c.i.f.fr e. | cost, insurance, freight and exchange |
| c.i.f.i. | cost, insurance and freight plus interest |
| c.i.f.i.fr e. | cost, insurance, freight, interest and exchange |
| c.i.f.L.t. | cost, insurance, freight, London terms |
| I.C.A.O. | International Civil Aviation Organization |
| I.C.R.P. | International Commission on Radiological Protection |
| Joint C4I Command, Control, Communications, Computers and Intelligence Program Assessment Tool | JCPAT (Obsolete, см. KM/DS (Knowledge Management/Decision Support Tool)) |
| O.I.C. | Oil Industry Commission |
| s.I.&c. | shipper's load and count |
