sine - snow
- sine curve
- sine galvanometer
- single Doppler radar
- single drift correction
- single scattering albedo
- single scattering approximation
- single sideband
- single space mean
- single-grid-heading navigation
- single-heading navigation
- single-station analysis
- single-station forecasting
- single-theodolite observation
- single-wavelength lidar
- singular corresponding point
- singular point
- singular vector decomposition
- singularity
- sink
- sinking
