JSON web site uses very clear notation to describe JSON’s syntax:

(source: json.org)
What is the name of such notation? Is this is just a graphical presentation of BNF or it has it’s own name?
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These are called Syntax Diagrams (or railroad diagrams)
“are a way to represent a context-free grammar. They represent a graphical alternative to Backus–Naur Form or EBNF”