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Euler diagram of the terminology of the British Isles
(lemmy.sdf.org)
Apologies. This might not be the perfect community for the post.
Exactly - that's it's proper name and how it's distinguished from Northern Ireland since they share the land mass of Ireland
You did a great job on this though, OP. It's difficult to explain to non-nationals with no idea of the history, so this is very helpful