Throughout the tea trade there is an international tea language - English. However, it is English with a difference. For example, when people talk about the grade of a leaf, it has nothing to do with quality, but refers to the size of leaf particle.
Dust is a term given to the smallest leaf particle.
In America dust is often termed finings. Made tea refers not to tea brewing in the pot, but to tea at the end of production. These are just a few examples of tea trade vocabulary, which enables its people throughout the world to understand each other completely - and here are a few more.