symbol

Hello and thank you for answering my question! While being not a Muslim, I find the Qur’an a very interesting work. I’m currently doing some research concerning various religious symbols and I hope that you could help me. I don’t know who else to ask. The symbol for Islam is the crescent moon and star, but, I can find no mention as to its symbolism and how it originated. I have asked a few of my Muslim friends and they didn’t know. Any info you could give me and any passages from the Qur’an concerning its symbolism/origin would be greatly appreciated and help with my continuing research. Thank you.