We have never been told what the ECHO acronym means, right?

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We have never been told what the ECHO acronym means, right?
In the first game, Claptrap calls it (1, 2):
... ECHO communication device and heads-up display ...
So, it could be recursive...
ECHO Communicator and Heads-up Overlay
or something.
But we don't know, right?
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Echo \u0026 The Bunnymen - The Killing Moon (Official Music Video)
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Images: Brett Sayles, Pavel Danilyuk, Pavel Danilyuk, Sharon McCutcheon