Sign
The sign of a number, also called Sgn, is 
for a Negative number (i.e., one with a Minus Sign``
''), 0 for the number Zero, or 
for a Positive number (i.e., one with a Plus Sign ``
'').
- Coaxal Circles
- Coaxaloid System
- Coaxal System
- Cobordant Manifold
- Cobordism
- Cobordism Group
- Cobordism Ring
- Cochleoid
- Cochleoid Inverse Curve
- Cochloid
- Cochran's Theorem
- Cocked Hat Curve
- Cocktail Party Graph
- Coconut
- Codazzi Equations
- Code
- Codimension
- Coding Theory
- Coefficient
- Coefficient Field
- Coercive Functional
- Cofactor
- Cohen-Kung Theorem
- Cohomology
- Cohomotopy Group