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Re:Visualising Complex APIs Using API Map by Bombthecat on Sunday February 05, 2017 @03:13AM (#13571446)
Looks like an erd from databases.

I think I didn't see one since like ten years?

Re:Visualising Complex APIs Using API Map by suhaschatekar on Sunday February 05, 2017 @03:53AM (#13571533)
It has lot of similarities with ERD so can say it is ERD for API.