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by aidenn0 976 days ago
There are claims it comes from the latin "ad" similar to how & comes from the latin "et" but the etymology is far less certain, with the french à being another possible source.

What I can't find is when it was first used in the US for indicating home-team for sports. E.g. [1] where there is vs. or @ depending on whether it is a home or away game. I suspect it's relatively modern, but not sure how far back it goes.

1: https://www.mlb.com/redsox/schedule/2023-09