'Returns the symbol of the tensor.
Examples
>>> from sympy import symbols
>>> from sympy.physics.secondquant import AntiSymmetricTensor
>>> i, j = symbols(\'i,j\', below_fermi=True)
>>> a, b = symbols(\'a,b\', above_fermi=True)
>>> AntiSymmetricTensor(\'v\', (a, i), (b, j))
AntiSymmetricTensor(v, (a, i), (b, j))
>>> AntiSymmetricTensor(\'v\', (a, i), (b, j)).symbol
v'

@property
def symbol(self):

    return self.args[0]
