What is the Engineer's Magic Box?

[octohydra]

I figured this is the best place for asking this question. My apologies for those that find it inappropriate.

I am looking for an image of the engineer's magic box for a powerpoint :(. If it has a proper name, please tell me. See the attachment for my MS Paint representation.

 

[EngAB]

Hi
I think it is called "Black box"
have a look here
http://en.wikipedia.org/wiki/Black_box
Regards

 

[octohydra]

Hi
I think it is called "Black box"
have a look here
http://en.wikipedia.org/wiki/Black_box
Regards

Thanks!