Borrowed from the Spaniards, the Naja is basically a crescent shape which captured the imagination of the Native Americans. It is possible the Native Indians first spotted the crescent shape on Spanish horses.
Naja: (or "Najah") From the Navajo word "Najahe", meaning "crescent". A crescent-shaped silver ornament believed to go back to Moorish designs that was originally a forehead pendant on horse bridles. It is now commonly found pendant from the bottom of a squash blossom necklace.
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A shape that the Spanish Conquistadores used as buttons on their trousers. The squash blossom necklace is composed of beads resembling squash blossoms placed at regular intervals with a naja, (crescent shaped pendant), at the center.
See also: What is the meaning of Jewel, Jewelry, Stone, Silver, Necklace?