alcohol-by-volume (alc/vol) number. This may lead to confusion over similar products bought in varying regions that have different names on country-specific labels. For example, Stroh rum that is 80% ABV is advertised and labeled as Stroh 80 when sold in Europe, but is named Stroh 160 when sold in the United States.

In the United Kingdom, proof is 1.75 times the number (expressed as a percentage). For example, 40% alc/vol is 80 proof in the US and 70 proof in the UK.