Meaning of python indexing. e.g. t[...,0]

Question

tfp.layers.DistributionLambda(
        lambda t: tfd.Normal(loc=t[...,0],
                             scale=1))

I am trying to use tensorflow probability, but I am not sure about the indexingt[...,0] used in tfd.Normal function.

What does it mean? Is ... equal to :?