What is the name of such diagrams?

Question

I would like to generate diagrams like this, but I don't know what to look for.

Answer 1

This is the syntax diagram .

Syntax diagrams (or railway diagrams) are a way of representing context-free grammar.

References:

• How to read syntax diagrams
• Many examples
• Create syntax diagrams

Answer 2

They are called syntax diagrams or railway diagrams to display contextual free grammar.

There is a tool that can convert BNF notation to railroad charts