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A pair 
, where 
 is a Manifold and 
 is a Symplectic Form on 
.  The 
Phase Space 
 is a symplectic manifold.  Near every point on a symplectic
manifold, it is possible to find a set of local ``Darboux coordinates'' in which the Symplectic Form 
has the simple form
See also Manifold, Symplectic Diffeomorphism, Symplectic Form
References
Sjamaar, R.  ``Symplectic Reduction and Riemann-Roch Formulas for Multiplicities.''  Bull. Amer. Math. Soc.
  33, 327-338, 1996.