| vc | cutting speed (m/min) |
| fz | feed per tooth (mm/tooth) |
| ap | axial depth of cut (mm) |
| ae | radial depth of cut (mm) |
| RMS | root mean square |
| CMSE | composite multiscale entropy |
| SLD | stability lobe diagram |
| xy/ay | maximum value of displacement, acceleration (mm or m/s2) |
| Axy/Aay | amplitude of displacement/acceleration (mm or m/s2) |
| xy_RMS/ay_RMS | root mean square value of displacement/acceleration (mm or m/s2) |
| λs | helix angle (°) |
| m | the length of the chains |
| τ | scale factor |
| r | the similarity tolerance |
| σx | the standard deviation of the original time series |
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