| Off | official |
|---|
| ECG | Electro-Cardio-Graphy(-Gram); 심전도 = EKG 1. Conducting System Structu... |
|---|---|
| COT | colony overlay test; content of thought; contralateral optic tectum; critical off-time |
| HISKEW | Health Information Skeletonized Eligibility Write-off [file, Medicare] |
| O&O | on and off |
| TTO | time trade-off [method] |