What do the numbers used to differentiate Chinese slicer knives mean?
3 Rams is the brand. Pretty popular Chinese Cleaver manufacture. The number 2 is the weight of the knife. I think the numbers range from a #1(heaviest; bone chopping) down to a #5 (lightest; vegetable knife). If you're looking for a vegetable knife yours is probably on the heavy side. It's more suited to chopping up poultry/fish.

A couple articles/forums, which seem to confirm my guess that lower is heavier:
http://articles.chicagotribune.com/1989-01-26/entertainment/8902280958_1_cleaver-chopping-high-carbon
https://forums.egullet.org/topic/143953-is-this-chinese-knife-sufficient-for-chopping-poultry/

Edit and Disclaimer: The numbering system is also manufacture dependent; some go from a 1-3, some from a 1-5. I am sure there are others as well. Best place to verify, would be if you could scope out a chinese market/store that sells the knives to compare what you have.