What exactly does the asterisk (*) mean in WPF?

What is the purpose of the asterisk under the photograph on the US Visa Sticker?

Underneath the photo of the visa, there are two asterisks "**". Some visas only have one asterisk under the photo, and others have no asterisk at all. I would like to know the meaning of these asterisks. What does none mean, what does one mean, and what does two mean? I would like an answer that includes some references to an authoritative source, or at least a site that is reasonably trustworthy.
Answer:

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