Kyrgyzstan is one of the six independent Turkic states together with Turkey, Azerbaijan, Turkmenistan, Uzbekistan and Kazakhstan. Its capital and largest city is Bishkek. "Kyrgyz", is believed to have been derived from the Turkic word for "forty", in reference to the forty clans of Manas, a legendary hero who united forty regional clans against the Uyghers. By extension, Kyrgyz is also thought to mean "unconquerable" or "undefeatable".
The 40-ray sun on the flag of Kyrgyzstan is a reference to those same forty tribes and the graphical element in the sun's center depicts the wooden crown of a yurt -- a portable dwelling traditionally used by nomads in the steppes of Central Asia. (source)
Thank you Rustam!