How to translate in German:
There aren't many of these city distance signs around.
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The shortest German term i know for this is
Schilder, die die Entfernung zu Weltstädten zeigen
or for the entire pole with many such sings:
Schilderbaum, der die Entfernung zu Weltstädten zeigt
I cannot deny that this is a relative clause and that therefore some people may struggle with accepting this as a word. (Although when we start into debating word boundaries I might even win that debate.)
Now, for the sake of experimenting, we could try to create one-word-solutions:
This would be a working solution, not too long, and unambiguously intelligible.
More beautiful, but perhaps not that practical as not fully self-explanatory would be:
This impresses through compendiousness and an inner alliteration.
It could be used for the single sign as well as for the entire contraption (pole and multiple signs).
The problem with both of them is that probably the first place where these words have ever been published is... here.
I am developing the feeling that perhaps
might be in use somehow, although it is clearly totally unspecific and could mean a plethora of other things, too.