If you mean the words "Standard Normal" like math people mean them, then the answer is 1.
There are many normal distributions. Each one can have its own mean and its own standard deviation. They are all bell-shaped curves. But it is very hard to figure things out under a bell shaped curve, so we "standardize" all of the possible Normal Distributions by moving them down to be centered at 0 and have a standard deviation of 1. Then we can all use the same "z-score" table to find out the data under our individual Normal Distributions.
There are infinitely many "NORMAL" distributions, but only ONE Standard Normal Distribution.