- line of force
- line of horizon
- line of integration
- line of intersection
- line of latitude
- line of longitude
- line of projection
- line of regression
- line of sight
- line of singularity
- line of slope
- line of steepest slope
- line of stream
- line of striction
- line of support
- line of swiftest descent
- line overrelaxation
- line pair
- line partitioning
- line pedal curve
- line picking
- line-plane intersection
- line point picking
- line relaxation
- line relaxation method