- sign of per mille
- sign of power
- sign of ratio
- sign of separation period
- sign of subtraction
- sign of trigonometric function value
- sign of trigonometric function values of different quadrant angles
- sign of two projection methods
- sign rule of a fraction
- signum function
- silk-screen printing
- silk-screen printing
- Silov boundary
- Silov boundary of a domain
- Silver principle
- simi-fine boundary value
- similar axis
- similar central simple algebras
- similar coefficient
- similar correspondence of two spheres
- similar division of the line segment
- similar edges
- similar figures
- similar figures
- similarity