In wich way has created this map?

Hi to all. I' m a new user of this fantastic forum, and this fantastic software!! :P
I' m sorry for my bad english, because I' m not english.
I' ve got a question:
In wich way has created this map? They are not normal symbols, and I want more informations. Please, tell me about this map... I really like that type of map!!
image

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