Phase
The angular position of a quantity. For example, the phase of a function 
as a function oftime is
The Argument of a Complex Number is sometimes also called the phase.See also Argument (Complex Number), Complex Number, Phasor, Retardance
- Cesàro Equation
- Cesàro Fractal
- Cesàro Mean
- Ceva's Theorem
- Cevian
- Cevian Conjugate Point
- Cevian Transform
- Cevian Triangle
- Chain
- Chained Arrow Notation
- Chainette
- Chain Fraction
- Chain (Graph)
- Chain Rule
- Chair
- Chaitin's Constant
- Chaitin's Number
- Chaitin's Omega
- Champernowne Constant
- Change of Variables Theorem
- Chaos
- Chaos Game
- Character (Group)
- Characteristic Class
- Characteristic (Elliptic Integral)