Our new character today is 扇, which is composed of 户 and 羽. What does it mean?
Its original meaning is quite clear: a door which opens and closes like flapping wings, illustrated as below.
So you would not be surprised to see 扇 to be used as quantifier of doors or windows, for example: 一扇门.
In ancient China, while emperor was patrolling his country, two concubines would hold a big 扇 each to help to block the Sunlight, shield dust and wind for the emperor. Such 扇 was made by bird feathers and sometimes waved like what 扇 originally means. That is why 扇 was used to mean it, which is shown below:
|two 扇 for an emperor|
|诸葛亮 with his 羽扇|
|evolution history of 扇|