There are multiple definitions:
erythrocyte sedimentation rate(English)
electron spin resonance(English)
edge-to-edge separation ratio(English)
- or, more commonly, edge-to-edge spacing and edge distance (e/D ratio), refers to the measurement between the closest points of two objects (e.g., holes, traces, or structural members) rather than their centerlines
- HMDS
- Ratio-based metric