| HRC | Rockwell hardness |
| HSS | high speed steels |
| IC | index correlation |
| MRR | material removal rate |
| Ra | parameter of surface roughness (µm) |
| S(A) | function expressing the sum of squared differences |
| I | peak current (A) |
| ton | pulse on-time duration (µs) |
| toff | pulse off-time duration (µs) |
| U | voltage of discharge (V) |
| y | desired value function |
| x | measured values |
| x min/max | lower/upper response limit values |
| Micro-WEDM | micro-wire electrical discharge machining |
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