Question: Where is documentation for `<,>`?

I have a very difficult time finding things in the documentation.

I would like to see documentation for `<,>` and `<|>`, as in `<,>`(1,2,3,4).

If I write ?<|> in Maple I get

If I do ?<,> I get

However, there is no mention of the usage of the backticks.

Finally, if I do ?`<,>` I get

No mention of the use of `<,>`. I only know about this from a previous reply to one of my questions and now I have forgotten the details so I am trying to look it up but it's hard to find.

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