Flag of East Turkestan

The flag of East Turkestan (), often referred to as the East Turkestan flag, and also known as Kökbayraq / Көкбайрақ ("Sky flag" or "Blue flag"), was the national flag of the First East Turkestan Republic (1933-1934). The East Turkestan Flag has a white crescent (young waxing moon) with a five pointed star on blue background, it was adopted on 12 November 1933 as the national flag of East Turkestan during Declaration of the Turkish Islamic Republic of East Turkestan.
Usage.
In modern times it is popularly used as a symbol of the East Turkestan independence movement. It was used by Uyghur activists in protests involving China's re-education camp system in Xinjiang.
The blue colour (background) is taken from the colour of the sky and is a predominant colour in Turkic culture that represents the sky, essentially the blue represents Turkic peoples. The crescent represents the notion of being victorious (un-defeatable) and is not necessarily an Islamic symbol, in-fact it was the Turks that introduced the crescent into the Islamic world. The star represents the Turkic nation, it is also found on the flag of the White Hun (Hephthalite) Empire and various other Turkic empires and states.
Colours.
In a RGB colour space, the blue of the East Turkestan flag is composed of 101/183/255 (dec); in hexadecimal colour code (##0099FF)