| EAR | Eye aspect ratio |
| EEC | Electroencephalography |
| EMG | Electromyography |
| EMKEY | Emulator of mouse and keyboard |
| MAR | Mouth aspect ratio |
| MP3 | MPEG-1 Audio Layer III |
| OS | Operating system |
| RAM | Random access memory |
| SBC | Single-board computer |
| SD | Standard deviation |
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