- singular set
- singular set function
- singular simplex
- singular simplicial set
- singular skeleton
- singular solution
- singular space
- singular spectrum
- singular stationary process
- singular stochastic process
- singular structure
- singular submanifold
- singular submodule
- singular subspace
- singular subvariety
- singular support
- singular surface
- singular system
- singular tangent
- singular tangential plane
- singular term
- singular theory
- singular torus
- singular transformation
- singular value