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Another possibility is to use Python's del to delete an object:

sage: del x
sage: x
---------------------------------------------------------------------------
NameError                                 Traceback (most recent call last)

/home/vbraun/opt/sage-4.7.1.alpha2/local/include/singular/<ipython console> in <module>()

NameError: name 'x' is not defined
sage: x = var('x')
sage: x
x