- similar monomial
- similar of matrices
- similar polygons
- similar polyhedron
- similar radicals
- similar ratio
- similar ratio of a figures
- similar sectors
- similar segments of a circle
- similar solution of boundary layer equations
- similar test
- similar transformation
- similar transformation group
- similar triangles
- similar triangles in a right triangles
- similar vertices
- similia circle of two constant circles
- Simon-Newcomb's problem
- Simons inequality
- simple algebra
- simple alternative algebra
- simple arc
- simple average method
- simple block design
- simple Boolean algebra