Unit Vector
A Vector of unit length. The unit vector 
having the same direction as a given (nonzero) vector vis defined by
where
denotes the Norm of 
, is the unit vector in the same direction as the (finite) Vectorv. A unit Vector in the 
direction is given by
where
is the Radius Vector.See also Norm, Radius Vector, Vector- Hamiltonian System
- Hamilton's Equations
- Hamilton's Rules
- Hammer-Aitoff Equal-Area Projection
- Hamming Function
- Ham Sandwich Theorem
- Handedness
- Handkerchief Surface
- Handle
- Handlebody
- Hankel Function
- Hankel Function of the First Kind
- Hankel Function of the Second Kind
- Hankel Matrix
- Hankel's Integral
- Hankel Transform
- Hann Function
- Hanning Function
- Hanoi Graph
- Hanoi Towers
- Hansen-Bessel Formula
- Hansen Chain
- Hansen Number
- Hansen's Problem
- Happy Number