Weight = wt.
In the U.S., the abbreviation for "ounces" is oz. I don't know if the answer varies in different parts of the world.
The abbreviation oz for the word ounce or ounces come from the old Italian word onza which meant ounce. The word in modern Italian is oncia.
oz is the abbreviation for ounces. If you are truly asking "why" the word ounces is abbreviated, I assume it's the same reason any abbreviation - it's easier and faster than writing the entire word; especially when writing/copying recipes.
The correct abbreviation for ounces is "oz."
OZ
The correct abbreviation for ounces is oz. (please recommend me ;_;)
An ounce is a unit of measurement that is often used in baking recipes. The abbreviation of the word ounces is written as oz.
Ounces and mg.
Yes, they are widely used.
Ounces
One explanation is from the Latin origin of the word. In Italian the word for ounce is onza (meaning one twelfth), therefore, we use oz as the abbreviation even though we have changed the word into English. Similarly the abbreviation for pound is lb. Again from Latin origin, libra.