Why is rectangular hyperbola called so?

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Why is rectangular hyperbola called so? Is there any connection between this type of hyperbola and a rectangle?

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I think Henry's comment is the complete right answer so I'm posting it:

A hyperbola has two asymptotes. If these intersect in a right-angle then it can be called a rectangular hyperbola. Similarly, if the angles at the four vertices of a quadrilateral are right-angles then it is a rectangle.

I suppose it wouldn't hurt to add that "rectangular" doesn't just mean "has something to do with rectangles". It also means "having right angles", which is why rectangles are called that.