Here is what a website had to say about the New Mexico flag.
The yellow field and red symbol colors are the colors of Spain. First brought to New Mexico by Spanish explorers in 1540. On New Mexico's flag we see a red sun with rays streching out from it. There are four groups of rays with four rays in each group. This is an ancient sun symbol of a Native American people called the Zia. The Zia believed that the giver of all good gave them gifts in groups of four. These gifts are:
1. The four directions - north, east, south and west.
2. The four seasons - spring, summer, fall and winter.
3. The day - sunrise, noon, evening and night.
4. Life itself - childhood, youth, middle years and old age.
5. All of these are bound by a circle of life and love, without a beginning or end.
I find it very interesting how the meaning of symbols changes with the culture and education of the viewer. To most Americans the flyflot is a swastika. A Maltese cross, a german or templar symbol.
I used to mark many of my belongings (especially anything I made for myself_ with a Cross constructed with equal length arms, the 2nd and fourth quandrants closed by a line, but then some one else started claiming it was some ancient symbol for a scribe, that isnt' me. So now I just use my initials, boring huh?