Does IPython have a "restart"?

I  mean something equivalent to what you get when you do a Ctrl+F6 in IDLE:

>>> import math
>>> math.log(3)
1.0986122886681098
>>> =============================================== RESTART ===============================================
>>> math.log(3)

Traceback (most recent call last):
  File "<pyshell#9>", line 1, in <module>
    math.log(3)
NameError: name 'math' is not defined
>>>

Thanks,

Dick Moores