There are several Muslim countries that feature the crescent moon symbol on their national flag. See them and find out more about them here.
Flag of Singapore - Wikipedia
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Flags of Muslim Countries With a Crescent Moon
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Flags of Muslim Countries With a Crescent Moon
Muslims union flag I made (moon is a symbol for Muslim 10 5 pointed stars for the 50 main Muslim countries) : r/flags
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Flag of an Islamic Country I made for a story I'm writing. : r/vexillology
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