Page "Analog television" Paragraph 10

In principle all three color encoding systems can be combined with any scan line / frame rate combination.

Therefore, in order to describe a given signal completely, it's necessary to quote the color system and the broadcast standard as capital letter.

For example the United States uses NTSC-M, the UK uses PAL-I, France uses SECAM-L, much of Western Europe and Australia uses PAL-B / G, most of Eastern Europe uses PAL-D / K or SECAM-D / K and so on.