What does a circle with a star in the middle mean?

something for protection
There are a number of businesses that have chosen the logo of a star within a circle. It has no particular meaning aside from that which the businesses with the logo have assigned to it. Some of these businesses are:

• Converse
• Texaco
• Circle Star Energy
• Celestial Registry Inc.
• Circle Star Blankets, Inc. of Buffalo, Wyoming.
• Circle Star Farms of Sams Valley, Oregon
• Cedar Point Yacht Club