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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Mississippian (geology) (Wikipedia) The Mississippian (/ˌmɪsɪˈsɪpi.ən/ miss-ə-SIP-ee-ən, also known as Lower Carboniferous or Early Carboniferous) is a subperiod in the geologic timescale or a subsystem of the geologic record. It is the earlier of two subperiods of the Carboniferous period lasting from roughly 358.9 to 323.2 million years ago. As with most other geochronologic units, the rock beds that define the Mississippian are well identified, but the exact start and end dates are uncertain by a few million years. The Mississippian is so named because rocks with this age are exposed in the Mississippi Valley.

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.