Bangladesh has six seasons which is different from the usual four seasons. The six seasons are summer, rainy season, autumn, late autumn, winter and spring. They can be added as a special stamp set for Bangladesh.

Autumn is characterised by catkin flowers. https://www.google.com/imgres?imgurl=https%3A%2F%2Flive.staticflickr.com%2F4493%2F36840541904_898a118138_b.jpg&tbnid=uyQHCgy89-BGcM&vet=1&imgrefurl=https%3A%2F%2Fwww.flickr.com%2Fphotos%2F152014986%40N07%2F36840541904&docid=uYhqjzuvfwqWoM&w=1024&h=683&source=sh%2Fx%2Fim%2Fm5%2F2&kgs=e75f431e3b432f31