"Sergiu exuberantly offers up shot glasses of mulberry vodka, pine-needle vodka, strawberry vodka, “medicine” vodka, “78 per cent proof” vodka" Although Moldova has vodka-drinking Slavs in it, the beverages described are not vodkas. Vodka is made of cereals or potatoes, whereas these are nicer-flavored, fruit-based distilled beverages that locals call "rakiu", in English it would be schnapps: https://en.wikipedia.org…
78% or 78 degrees proof? They are different measures in different places. Slivovitz, for instance, is typically 70% alcohol. Proof spirit (100 proof) in the UK is 57.06% alcohol by volume, in the US and Australia it is 50%, in France Gay-Lussac defined proof degree and percent alcohol by volume to be the same. See https://www.britannica.com/story/why-is-alcohol-measured-by-...
It's always percent ABV (alcohol by volume). As you can see in this table, typical values for rakia (rachiu in Romanian) are 40–86% ( https://en.wikipedia.org/wiki/Alcohol_by_volume ).
Degrees proof is a term originating in English tax law where the drink catching fire was deemed 100 proof. But it's only used in the US now.