| 
 | 
 | 
A two-component Complex column Vector.  Spinors are used in physics to represent particles
with half-integral spin (i.e., Fermions 
).
References
Lounesto, P. ``Counterexamples to Theorems Published and Proved in Recent Literature on Clifford Algebras, Spinors,
  Spin Groups, and the Exterior Algebra.''
  http://www.hit.fi/~lounesto/counterexamples.htm.
 
Morse, P. M. and Feshbach, H.  ``The Lorentz Transformation, Four-Vectors, Spinors.''  §1.7 in
  Methods of Theoretical Physics, Part I.  New York: McGraw-Hill, pp. 93-107, 1953.