1935 S Peace dollar - 4 ray

What exactly does the designation "4 ray" indicate? Is this found on other peace dollars or only on the 1935 S?
No Way Out: Stimulus and Money Printing Are the Only Path Left
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Leo
The more qualities observed in a coin, the more desirable that coin becomes!
My Jefferson Nickel Collection
No Way Out: Stimulus and Money Printing Are the Only Path Left
No Way Out: Stimulus and Money Printing Are the Only Path Left