Nonpositive
A quantity which is either 0 (Zero) or Negative, i.e., 
.
- Inverse Hyperbolic Secant
- Inverse Hyperbolic Sine
- Inverse Hyperbolic Tangent
- Inversely Similar
- Inverse Matrix
- Inverse Points
- Inverse Quadratic Interpolation
- Inverse Scattering Method
- Inverse Secant
- Inverse Semigroup
- Inverse Sine
- Inverse Tangent
- Inverse Trigonometric Functions
- Inversion
- Inversion Center
- Inversion Circle
- Inversion Operation
- Inversion Radius
- Inversive Distance
- Inversive Geometry
- Inverted Funnel
- Inverted Snub Dodecadodecahedron
- Invertible Knot
- Involuntary
- Involute