Why are these 32 symbols found in ancient caves all over Europe?

In this Ted Talk, a woman that have been in a lot of caves with his husband, try to explain us that the ancient cultures from a lot of years ago, are very interesting to study, she already did it, she went to a lot of already explored caves and in the 75% of this caves she and his husband found new and unknown paintings.

This woman try to explain us that the signs that are in all around Europe are very similar, they are just 32 signs that are used like a signs language.

That makes us think, because if this signs language were a way of communicating of the oldest cultures we know, we are in front of the oldest signs language known.

In all this caves appear signs like a triangle or a circle, trying to tell us something that we are not able to understand, but in the past, they made that in the cave to tell people that came later that there happened something, or even to tell them that the place wasn't very good, or a lot of other things, like where to find food, or even where to find people.

Finally, I think this Ted Talk have been very interesting to listen, and to sum up, I would like to say that i didn't know a lot of this signs symbols in all the caves of Europe, but now I know that they were used to communicate with others.

Jofre Torner