ounces (translated from Hong Kong into ounces) are English units of measurement, with the symbol ounce or oz. As a unit of weight, it is also called English ounces.

constant ounce: unit of weight. The overall abbreviation is oz.av

1 ounce = 28.35g

1 ounce =16 dram)

16 ounces =1 pound

troy ounce: unit of weight. The overall abbreviations are oz.tr (English) and oz.t (American). Common in the measurement of precious metals such as gold and silver.

1 ounce = 31.135g

12 ounces =1 lbs pound

drug balance ounce: weight unit, abbreviated as ap oz as a whole.

1 ounce = 31.13g

liquid ounce: the unit of measurement, with the symbol of oz

1 English liquid ounce = 28.41ml

1 American liquid ounce = 29.57ml

Reference: Wikipedia.