| ACC | Accelerometer |
| AHRS | Attitude Heading Reference System |
| ALT | Altitude |
| ATC | Attitude Control |
| AP | ArduPilot |
| APM | ArduPilot autopilot |
| ARSPD | AirSpeed |
| ATT | Attitude |
| BATT | Battery |
| CTUN | Control Tuning |
| DCM | Discrete Cosine Matrix (first generation position/attitude estimator) |
| EKF | Extended Kalman Filter (a predictive filter subsystem) |
| EK2/3 | EKF2/EKF3 (ArduPilot has two generations of EKF based position/attitude estimators in the firmware) |
| GCS | Ground Control Station |
| GPS | Global Positioning System |
| GYRO | Gyroscope |
| IMU | Inertial Measurement Unit |
| INS | Inertial Navigation System |
| PCS | Position Control System |
| PM | Power Module |
| RC | Radio Control |
| TECS | Total Energy Control System (altitude/speed controller for Plane) |
| WP | Waypoint |
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