Anyone can help me to give information about 2U/3U, and what is U standing for?

Don't know what U stands for, but 2U rackets are heavier than 3U rackets.

Its a scale from U-4U not sure if there is 5U.

But anyway, U is the heaviest about 104g, 2U is about 94g, 3U is about 89g, 4U is about 81g.

I've also heard of 2L and stuff, but not sure how heavy that is.....

Thank's for your information Byro, btw. where do you live........?

Singapore

These are a measure of the weight of a racket:

3L: 100 - 104 grams
U: 95 - 99 grams
2U: 90 - 94 grams
3U: 85 - 89 grams
4U: 80 - 84 grams ?

By the way, does G3/G4 etc. mean the size of the handle on the racquet??

G is the grip size, 5 being the smallest