Yea, ye took up the tabernacle of Moloch, and the star of your god Remphan, figures which ye made to worship them: and I will carry you away beyond Babylon. (Acts 7:43)
Any thoughts?
Not really. No one has worshiped Molech or Remphan in thousands of years, nor am I aware of any archeological discoveries that would let us know what this star looked like or what it meant for those in that religion.
Various star shapes are quite common symbols, as are crosses, squares, circles, and diamonds. You have the five pointed star, the six pointed one, and the seven pointed one. After that, its just too difficult to draw. What a given star shape means in one culture will be very different than what it means in another. For example, like most American kids, I grew up drawing five pointed stars in my pictures of the night sky. It means nothing religious to me, despite the fact that the upside down version is used by the Church of Satan, or that modern Wiccans enjoy using the five pointer as one of their symbols.
Oh, I didn't think of it until just now, but maybe the Star of Remphan refers to a literal star in the heavens, like the North Star or Betelgeuse.