| # | Term | Stands For |
|---|---|---|
| 1 | OAM | Optical Additive Manufacturing |
| 2 | OCA | Optically Clear Adhesive |
| 3 | OCD | Optical Critical Dimension |
| 4 | OM | Optical Microscopy |
| 5 | OM.I | Optical Module Integration |
| 6 | OMI | Optical Modulation Index |
| 7 | OMM | Optical Measurement Machine |
| 8 | OPC | Optical Proximity Correction |
| 9 | OpEx | Operational Expenditures |
| 10 | OQC | Outgoing Quality Control |
| 11 | OST | Optical See Through |
| 12 | OTS | Off The Shelf |