| DCO | Diploma of the College of Optics |
|---|---|
| opt | best [Lat. optimus]; optics, optician |
| ECG | Electro-Cardio-Graphy(-Gram); 심전도 = EKG 1. Conducting System Structu... |
| FDS | Fellow in Dental Surgery; fiber duodenoscope; flexor digitorum superficialis |
| FF | degree of fineness of abrasive particles; fat-free; father factor; fecal frequency; fertility factor... |