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by dcuthbertson 4475 days ago
It's a reference to Alistair Cockburn's "Ports and Adapters" pattern, also called "Hexagonal Architecture".[1] The only reason I ever heard of it is that it was mentioned in the book "Growing Object-Oriented Software, Guided by Tests", by Steve Freeman and Nat Pryce (a good book in my opinion).

[1] http://alistair.cockburn.us/Hexagonal+architecture