What does the @ symbol mean?

Questions
#1

For example, msg.post("@render:", ...).

I recognize : as suffix for collection and # as prefix for component. In the example above, it looks like render takes the place of a collection (but it is not a collection) and the @ is tacked on as a prefix.

#2

@ is socket right?

I’m not sure what the technical term for the @ is here but it is used to reach places that are part of the engine like @system too.

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#3

It seems to me the whole “@render” is the socket.

I’ve always wondered about this too, btw.

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