What is rex in German?

There isn't a direct translation of "Rex" in German that means the same thing as it does in English, like a title or a name.

Here are some possibilities, depending on the context:

* "König" (king) - This would be the most common translation if "Rex" is used as a title. For example, "Rex" in the Latin phrase "Rex et Regina" would be translated as "König" in German.

* "Königlicher" (royal) - This is an adjective that describes something belonging to a king or related to royalty.

* "Rex" - You could also use the word "Rex" itself in German, especially if it's part of a name or a specific title.

It's best to provide more context about how "Rex" is being used so I can give you a more accurate translation.