| AI | Artificial Intelligence |
| DT | Digital Twin |
| F | Measured applied force |
| GUM | Guide to the expression of Uncertainty in Measurement |
| h | Measured penetration depth |
| J | Number of data points in each nanoindentation |
| K | Number of experimental nanoindentations |
| IC | Indentation Curve |
| ML | Machine Learning |
| t | Measured time |
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