Earlier quoted context omitted.
A lot of the world uses comma separators actually including basically all of Europe minus a few. The whole wikipedia article is kind of neat; never figured California would have a weird system for a while where decimal parts on signs were expressed as super scripts (eg 3^7 meant 3.7). https://en.wikipedia.org/wiki/Decimal_separator#/media/File:...
Superscript decimals are pretty common in the US for handwritten money amounts (like on checks or price tags) but outside that context it does seem weird!
https://4.imimg.com/data4/VV/RV/MY-3648905/price-tag-250x250...
https://www.coloraccounting.com/uploads/2/4/8/0/24801950/pub...
https://encrypted-tbn0.gstatic.com/images?q=tbn%3AANd9GcQu8D...
On gas stations, the superscript is indicating tenths of a penny, rather than pennies.
That latter practice is not exclusive to the US. This sign is from Germany or Austria I believe (LKW is German):
https://c8.alamy.com/comp/D3XKHG/price-board-a-gas-station-w...