| PE | Permutation Entropy |
| WPE | Weighted Permutation Entropy |
| AAPE | Amplitude-aware Permutation Entropy |
| MvPE | Multivariate Permutation Entropy |
| CPE | Coded Permutation Entropy |
| Std | Standard Deviation |
| SNR | Signal-to-Noise Ratio |
| Gr | Growth Rate |
| IRF | Inner Race Fault |
| BF | Ball Fault |
| ORF | Outer Race Fault |
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