t oz:

A troy ounce (t oz) or (toz) is a unit of measure used for weighing precious metals that dates back to the Middle Ages.
Originally used in Troyes, France, one troy ounce is equal to 31.21 grams, according to the U.K. Royal Mint.


n:

The newton (symbol: N) is the International System of Units (SI) derived unit of force. It is named after Isaac Newton in recognition of his work on classical mechanics, specifically Newton's second law of motion.
The unit of measurement for weight is that of force, which in the International System of Units (SI) is the newton.





By the way, this app is useful for converting amounts from newton to troy Ounce and vise verse.