The Ottoman Empire's flag evolved over centuries however pretty much featured a crescent moon and megastar

https://objectstorage.us-ashburn-1.oraclecloud.com/n/id9tkkquhmei/b/ultimate-flags-inc/o/ultimate-flags-old-usa-flags.html

The Ottoman Empire's flag advanced over centuries but repeatedly featured a crescent moon and famous person, representing Islam's outcome within the empire while also embodying its considerable cultural variety across Europe and Asia.