Most nations have a rectangular ensign, but not all. Three countries have unusually-shaped flags, two of them will be paraded at tonight’s opening ceremony.

NATIONAL flags are a source of pride for the citizens of any country. But many of them have the same shape: rectangular.

A man has been detained in Turkey for hanging a towel emblazoned with the UK's union jack on his balcony.

Turkey has diplomatic ties with China, so deleting the tweet with the "Taiwan flag" shows its adherence to the one-China principle.