Republic of Turkmenistan
Who & why: Turkmenistan declared independence on 27 October 1991. In 1995 it adopted a constitutionally declared status of permanent neutrality, formally recognized by a United Nations General Assembly resolution, and has since pursued one of the world's most famously isolationist foreign policies.
What it represents: a green field with a vertical stripe near the hoist bearing five traditional carpet guls (weaving patterns, one representing each major Turkmen tribe), above a white crescent moon and five stars, adopted in 1992 with minor design adjustments in later years.