Grading tea is complicated and is done differently in different countries. Still, all teas fall into four broad categories: Whole Leaf, Broken Leaf,
SFTGFOP: Special Finest Tippy Golden Flowery Orange Pekoe
This grade is primarily used to grade Darjeeling teas with a large proportion of leaves having golden tips on new leaf buds- a guarantee of quality.
FTGFOP: Finest Tippy Golden Flowery Orange Pekoe
Another grade primarily used to grade Indian black teas consisting of exceptional quality OP with lots of tips.
TGFOP: Tippy Golden Flowery Orange Pekoe
Golden refers to the buds, which have a lighter color than other leaves.
GFOP: Golden Flowery Orange Pekoe
FOP with a certain amount of golden tips.
OP: Orange Pekoe
Long, pointed leaves that are harvested when the terminal buds open into leaf. Rarely contains “tips.”
FP: Flowery Pekoe
Shorter, coarser leaves. The next leaves down from OP.
PS: Pekoe Souchong
Pekoe leaf further broken down is Pekoe Souchong.
Shorter and tightly rolled leaf style (for Indian Souchong). But when used for grading Chinese teas this refers to large leaves.
A variety of tea that is very rare. The leaf is extra large and when brewed the infused leaf extends to at least an inch to an inch and a half in length.
BROKEN LEAF TEA
GFBOP: Golden Flowery Broken Orange Pekoe
FBOP: Flowery Broken Orange Pekoe
GBOP: Golden Broken Orange Pekoe
TGBOP: Tippy Golden Broken Orange Pekoe
BOP: Broken Orange Pekoe
BOPF: Broken Orange Pekoe Fannings
Leaf size that is smaller than BOP is graded as fannings. This grade is primarily used in tea bags since it is small and steeps very quickly.
The mentioned grades are the ones that are widely used. A grade of tea only describes the leaf style of that particular tea and not the quality. Quality of a tea can only be decided after tasting it.