The sun symbol of the Native American Zia Pueblo has four arms signifying the importance of the number four in their spiritual beliefs: four figures in the four cardinal directions, the four seasons, the four aspects of the day (sunrise, noon, sunset, and night), and the four stages of life (childhood, youth, adulthood, and old age).

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Raven, volume 9-10 (2002–2003) (nava.org) Raven 9/10, covering 2002 and 2003, appears as a special double issue, American City Flags. This milestone vexillological work contains 150 articles dedicated to descriptions and histories of municipal flags of the United States. The cities represented include the largest 100 cities in the country, at least two cities per state, and all state capitals.