In this video, a Frenchman visits New York and buys a half sheet pan, which he appears unfamiliar with (both the term and the device itself) despite being an experienced cook. So I'm wondering: is there not a sheet pan convention outside the US? I'd just assumed that the full/half/quarter sheet system was universal. Ditto for the sheet pan itself, since it's cheap and indestructible. Are those only used in the US?
(I did find this history of the standard sheet pan, which discusses patent filings and brand names in the US in the early 20th century, but that thread doesn't discuss whether it's unique to the US.)