It means: 2 stands for grade 2 steel, made of HRB335;; NC stands for brand, the abbreviation of your local brand letter Nanchang, and there is a brand on rebar; 22 stands for 22 mm in diameter. The weight of one meter is 2.98Kg.
The most important thing is the abbreviation of local brand letters.
For example, Nanchang is NC Xinyu XY Pingxiang PX.