This is how it looks in 99% of Czech Republic.
It changes to terrain signs painted on trees sometimes but it is also standard. I found 2 other signs for cyclists, some cross border route that decided to make their own on both sides. And still most cross border routes use cz standard signage.
So how it looks where you live? Am I just too spoiled by standards for hiking and cycling signage?
I’ll admit, I went to the Netherlands knowing conceptually of a number system, and expecting to plan it that way, but could not figure it out.
No app or map I could find would give me a simple list of numbers (partly because what apps did exist were Dutch-only), and when I travelled in the direction of one signpost, I ended up on intersecting/branching public streets that didn’t have any numerical signposts. Plus, I was constantly getting detoured by construction. I ended up relying entirely on Google Maps.