The Crescent and star...

This is the first flag of the Beylik of Osmanli (Ottoman) that was oficially gifted by Alaeddin Keykubad, the Anatolian Seljuk Khan to Ertugrul Bey, the father of Osman Bey. This flag was the symbol of the "uchbeylik" of Ertugrul Bey. Then, this flag was adopted by Osman Bey as the flag of his Beylik.

This is the later flag of the Ottoman Empire adopted before the conquest of Istanbul, and this was the first usage of crescent and sun symbols by an Islamic country in the word.

The red background symbolizes the west, and western Turks. Alaeddin Keykubad decided on this color because the "uchbeylik" was the western border of the Seljuks of Rum. the eight pointed star was in fact a "son" symbol, and had ancient Turkish origins.

And finally, the flag above is the official flag of modern Turkey. The shape of the crescent and the star symbol has partly changed from Ottoman flag. But it still symbolizes the western Turks with its red background, so the red color isnt something special for only Ottoman dynasty, but to all western Turks.

There are several theories of crescent and star. One of them are that symbol of Constantinople before the turkish conquest was a crescent and that Mehmed II just adopted the new symbol. The crescent does not seem to being used much before the conquest of Istanbul.

I think the closest thing you could call a "official flag" for the early Ottoman Empire was the "zulfikar", that three crescent flag with green background(i really like that one BTW) we have seen many times on paintings and movies does not seem to have been used IRL either. But like i say, there is different theories.

The red color on the flag of Republic of Turkey is the royal color of the Ottoman family.  Which is ironic if you think about the stance the republic had against the empire in the past....

thanks guys

they were actually kings, named Casper, Melchior and Balthasar

in Islamic stories kingdom of Saba was worshipping the Sun as per the news the brid brought to Prophet Sulyman (king solomon in christan stories).

and around Mecca before Mohammed (PBUH) their was three religions the Idol worshippers who belived in God but they belived that the Idols are like the connection between people and God.

the other two religions were christans and Jews

i think the persians religion was there too but may be they didnt come to arabia.

and by the way who are these three wise men??

 Sabaean was the kingdom in south arabia??

No. You can understand it from current Turkish language. We call medeterinnean as "AKDEN�Z" which means white sea, we call Black Sea as "KARADEN�Z" which means black sea, and that name is given by Turks...

Also red sea's name and Caspian Sea's names are given by Turks. We call caspian sea "Hazar Denizi", which takes its name from the Turkish khanate of Hazar...