What do the letters in the Panasonic camera model mean?

Problem description:

Panasonic cameras have NV-, AG- and other series, as well as M, DX, GS and other models. What do these mean? Please give me some advice.

Analysis:

There are also some, GS stands for small household cameras, and M stands for cameras using VHS video tapes. Just look at the catalogue of Panasonic website. Basically, a series uses a code, but the numbers behind the code are not horizontally comparable. Can only be compared in series, not horizontally. For example, GS 1 1 and GS 15 belong to a series and can be compared. Generally, the larger the number, the more functions. But it can't be compared with other series of figures. In addition, it can only be compared among products of the same period. Generally, the contrast between old products and new products is always worse, otherwise no one will buy new products.