Came across this open source project called fruit. In the documentation are some diagrams of the code. Here is an example from the tutorial page:

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Is there a standard for this type of diagram or is it just a custom one?

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That is a standard component diagram that is found in UML. I've heard some people call them a "lollipop diagram" because the sticks with small circles on the ends to represent a provided interface look like lollipops or a "ball and socket diagram" because of the balls and sockets used to represent provided and needed interfaces

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