It's part 1 - explaining the history of why we use @. I suspect (the well trailered) part 2 might answer the history of the symbol itself. I certainly couldn't

It's part 1 - explaining the history of why we use @. I suspect (the well trailered) part 2 might answer the history of the symbol itself. I certainly couldn't have guessed the contents of this carefully researched and well written post. Maybe I'm just not in your 'most of us'.