Can you explain the what the term "connector" refers to?

I would have *guessed* that "connector" refers to bothe the socket and
the plug.

But when I look at a chart of USB plug and socket dimensions
then I see "connector" being used to describe only the socket.

See http://www.us-electronics.com/files/usbconnectors.pdf.

What is the correct usage of the term "connector" with respect to
computers?