Following is an excerpt from a web page dedicated to The Great Art Of The Alhambra De Granada
The star was the most common Islamic design. In Islamic design, the star is a regular geometric shape that symbolizes equal radiation in all directions from a central point. All regular stars -- whether they have 5, 6, 8, 10, 12, or 16 points -- are created by a division of a circle into equal parts.
Here is an example from that web page of a Solomon's Seal found in a mosque at Lahore, Pakistan: