Why is an HVDC back-to-back system called that?

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The above diagram is for HVDC back to back system. My question is why do we call it back to back system?

Could someone please help me here?
 

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It's a sports metaphor - like two games, back to back.

In this case it is because you see an AC system connected at one end, and another at the other end: back to back.
 
UltrafastPED said:
like two games, back to back.
Could you please explain it? I am guessing "the two games happening immediately one after another. Correct?"
 
The simplest configuration is the back-to-back interconnection in which two converters are on the
same site without a transmission line.

Could someone please indicate the similarity between the bold part of the above sentence and the HVDC back-to-back system diagram above?
 

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