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I'm looking for visual language that does not require ability to read (except, say, knowing numbers 1 to 10). Does anything like this exist? I looked at Spark but that doesn't fall in to this category.

The idea is as follows: Devices like tablets and smartphones are naturally usable by 4-year old with minimal and even no instructions even if they can't read yet. Is there a visual programming language that can be implemented on such devices that is usable by just 4 year old?

Logical operations require the ability to read if not English than at least some form of formal grammar.
You would need to find a pre-literate VPL, like Kidsym, or maybe Hands. Those are research languages, but there seem to be a lot of pre-literate visual data-flow and block languages out there these days, none of them is especially popular but they work fine in their own way.
Scratch requires only a very basic understanding of terms, and has been widely extended, as in translated to many languages and perhaps completely visual versions have been made.

Here's a link to the base project → https://scratch.mit.edu

Sadly, I am still working on that.. My thoughts are on www.reddit.com/r/unseen_programming

Its structure is very similar to Luna. Instead of popup-lists, you can drag-drop functions into the program and connect them with lines.

But I don't know from what age it will work, they still must learn some symbols. +,- etc.

Alternatively, you could let them try fun computer-games that are close to programming. Like factoria.