I just tried to google the answer but to no avail, I did
wonder this myself some time ago, but I felt I had more
problems with the charts than finding out the answer.
Maybe there is a historian in the ranks who may be able to
help.
I’m a newbie myself, but I believe that in a currency cross, the stronger currency is listed first. Therefore, if the Euro ever depreciated enough that 1 USD bought more than 1 EUR, the cross would be listed as USDEUR. I am not positive about this, I will try and grab a source for you.
That is incorrect. The traded currency pairs are set as you see them having been established that way by whoever makes that decision for the inter-bank market. I’ve posted about this elsewhere on the site, but don’t recall where. The quick answer is that the major currencies have the following order of base dominance: