The Tibetan Flag
Tibet has always been a country where spirituality is integral to the government. As with many native cultures, there were both spiritual and secular leaders responsible for governing; in these cultures it has worked because the leaders consistently maintained spiritual values. For example, great teachers were said to have always knelt before their throne prior to taking their seat and teaching. They did this to recognize that the dharma (teaching) and the benefit of fellow learners (sangha) were the focus rather than the teacher him/herself.
The symbolism of the Tibetan Flag describes this special union of spirituality and government. Below is a picture of the flag along with a description of its symbolism:*
It is illegal to even display this flag in Tibet and those who do so are imprisoned.
In the centre stands a magnificent thickly snow clad mountain, which represents the great nation of Tibet, widely known as the Land Surrounded by Snow Mountains.
Across the dark blue sky six red bands spread representing the original ancestors of the Tibetan people: the six tribes called Se, Mu, Dong, Tong, Dru and Ra which in turn gave the [twelve] descendants. The combination of six red bands (for the tribes) and six dark blue bands for the sky represents the incessant enactment of the virtuous deeds of protection of the spiritual teachings and secular life by the black and red guardian protector deities with which Tibet has had connection for a very long time.
At the tip of the snow mountain, the sun with its rays brilliantly shining in all directions represents the equal enjoyment of freedom, spiritual and material happiness and prosperity by all beings in the land of Tibet. On the slopes of the mountain there proudly stand a pair of snow lions blazing with the manes of fearlessness, which represent the country's victorious accomplishment of a unified spiritual and secular life.
The beautiful and radiant three coloured jewel held aloft represents the ever-present reverence respectfully held by the Tibetan people towards the Three Supreme Jewels (the Buddhist objects of refuge: Buddha, Dharma and Sangha).
The two coloured swirling jewel held between the two lions represents the peoples' guarding and cherishing the self discipline of correct ethical behaviour, principally represented by the practices of the ten exalted virtues and the 16 humane modes of conduct.
One side of the flag has no border; this symbolizes the openness and tolerance of the Tibetan people towards non-Buddhist thought.
* I've taken this description directly from the website of the Tibetan government in exile: http://www.tibet.com.