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Question: what does 'rational &under cos' and `&*` mean in help pages?

Question:what does 'rational &under cos' and `&*` mean in help pages?

nm 8552 Maple 2018
syntax type
May 22 2018
1

I am looking at the help pages, and I see Maple code using symbols never seen in Maple language before.

I tried to do ?&under to get help on this new Maple language command/symbol, but help does not show it. I read help Neutral Operators but do not understand it.

What does the following mean in plain Maple code?

And what does the following mean using Plain Maple code:

 

Could the above be written without using these `&` things?  I am having hard time understanding what the code is doing because of these. Never used them before.

These are from help on "Definition of a Structured Type in Maple"
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