- indicator-rod
- indicators of groundwater genesis
- indicator species
- indicator species of marine pollution
- Indicator System
- indicator transition point
- indicator variable
- indicatrix
- indicatrix ellipse
- indicatrix of binormals
- indicatrix of curvature
- indicatrix of principal normals
- indicatrix of scattering
- indicatrix of tangents
- indices
- indices of climate extremes
- indices of crystal direction
- indices of crystal plane
- indices of diffraction
- indices of lattice direction
- indices of lattice plane
- indices of plane in crystal
- indicia
- indicial
- indicial equation